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Wikipedia

iOS

October 15, 2023

For other uses, see IOS (disambiguation).
Not to be confused with HiOS, an operating system developed by Tecno Mobile.

iOS (formerly iPhone OS)[5] is a mobile operating system developed by Apple Inc. exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone; the term also includes the system software for iPads (predating iPadOS, which was introduced in 2019) as well as on the iPod Touch devices (which were discontinued in mid-2022).[6] It is the world's second-most widely installed mobile operating system, after Android. It is the basis for three other operating systems made by Apple: iPadOS, tvOS, and watchOS.[7] It is proprietary software, although some parts of it are open source under the Apple Public Source License and other licenses.[8]

iOS
Commercial logo as used by Apple, since 2017
iOS 17 home screen
DeveloperApple Inc.
Written inC, C++, Objective-C, Swift, assembly language
OS familyUnix-like, based on Darwin (BSD), macOS
Working stateCurrent
Source modelClosed, with open-source components
Initial releaseJune 29, 2007; 16 years ago (2007-06-29)
Latest release17.0.3[1] (October 4, 2023; 11 days ago (2023-10-04)) [±]
Latest preview17.1 beta 2[2] (October 3, 2023; 12 days ago (2023-10-03)) [±]
Marketing targetSmartphones, tablet computers, portable media players
Available in41 languages[3]
List of languages
Arabic, Bulgarian, Catalan, Chinese, Simplified, Chinese, Traditional (Hong Kong), Chinese, Traditional (Taiwan), Croatian, Czech, Danish, Dutch, English (Australia), English (United Kingdom), English (United States), Finnish, French (Canada), French (France), German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kazakh, Korean, Malay, Norwegian, Polish, Portuguese (Brazil), Portuguese (Portugal), Romanian, Russian, Slovak, Spanish (Latin America), Spanish (Spain), Swedish, Thai, Turkish, Ukrainian, Vietnamese
Update methodOTA (since iOS 5), Finder (from macOS Catalina onwards)[4] or iTunes (Windows and macOS pre-Catalina)
Platforms
Kernel typeHybrid (XNU)
Default
user interface		Multi-touch, graphical user interface
LicenseProprietary software except for open-source components
Official websiteapple.com/ios
Support status
Supported
Articles in the series
iOS version history

Unveiled in 2007 for the first-generation iPhone, iOS has since been extended to support other Apple devices such as the iPod Touch (September 2007) and the iPad (introduced: January 2010; availability: April 2010). As of March 2018, Apple's App Store contains more than 2.1 million iOS applications, 1 million of which are native for iPads.[9] These mobile apps have collectively been downloaded more than 130 billion times.

Major versions of iOS are released annually. The current stable version, iOS 17, was released to the public on September 18, 2023.[10]

History

See also: iOS version history

In 2005, when Steve Jobs began planning the iPhone, he had a choice to either "shrink the Mac, which would be an epic feat of engineering, or enlarge the iPod". Jobs favored the former approach but pitted the Macintosh and iPod teams, led by Scott Forstall and Tony Fadell, respectively, against each other in an internal competition, with Forstall winning by creating the iPhone OS. The decision enabled the success of the iPhone as a platform for third-party developers: using a well-known desktop operating system as its basis allowed the many third-party Mac developers to write software for the iPhone with minimal retraining. Forstall was also responsible for creating a software development kit for programmers to build iPhone apps, as well as an App Store within iTunes.[11][12]

The operating system was unveiled with the iPhone at the Macworld Conference & Expo on January 9, 2007, and released in June of that year.[13][14][15] At the time of its unveiling in January, Steve Jobs claimed: "iPhone runs OS X" and runs "desktop class applications",[16][17] but at the time of the iPhone's release, the operating system was renamed "iPhone OS".[18] Initially, third-party native applications were not supported. Jobs' reasoning was that developers could build web applications through the Safari web browser that "would behave like native apps on the iPhone".[19][20] In October 2007, Apple announced that a native Software Development Kit (SDK) was under development and that they planned to put it "in developers' hands in February".[21][22][23] On March 6, 2008, Apple held a press event, announcing the iPhone SDK.[24][25]

 
iPhone (first generation), the first commercially released device running iOS (2007)

The iOS App Store was opened on July 10, 2008, with an initial 500 applications available.[26] This quickly grew to 3,000 in September 2008,[27] 15,000 in January 2009,[28] 50,000 in June 2009,[29] 100,000 in November 2009,[30][31] 250,000 in August 2010,[32][33] 650,000 in July 2012,[34] 1 million in October 2013,[35][36] 2 million in June 2016,[37][38][39] and 2.2 million in January 2017.[40][41] As of March 2016, 1 million apps are natively compatible with the iPad tablet computer.[42] These apps have collectively been downloaded more than 130 billion times.[37] App intelligence firm Sensor Tower estimated that the App Store would reach 5 million apps by 2020.[43]

In September 2007, Apple announced the iPod Touch, a redesigned iPod based on the iPhone form factor.[44] On January 27, 2010, Apple introduced their much-anticipated media tablet, the iPad, featuring a larger screen than the iPhone and iPod Touch, and designed for web browsing, media consumption, and reading, and offering multi-touch interaction with multimedia formats including newspapers, e-books, photos, videos, music, word processing documents, video games, and most existing iPhone apps using a 9.7-inch (25 cm) screen.[45][46][47] It also includes a mobile version of Safari for web browsing, as well as access to the App Store, iTunes Library, iBookstore, Contacts, and Notes. Content is downloadable via Wi-Fi and optional 3G service or synced through the user's computer.[48] AT&T was initially the sole U.S. provider of 3G wireless access for the iPad.[49]

In June 2010, Apple rebranded iPhone OS as "iOS".[50][51] The trademark "IOS" had been used by Cisco for over a decade for its operating system, IOS, used on its routers. To avoid any potential lawsuit, Apple licensed the "IOS" trademark from Cisco.[52]

The Apple Watch smartwatch was announced by Tim Cook on September 9, 2014, being introduced as a product with health and fitness-tracking.[53][54] It was released on April 24, 2015.[55][56][57] It uses watchOS as its operating system; watchOS is based on iOS, with new features created specially for the Apple Watch such as an activity tracking app.[58]

In October 2016, Apple opened its first iOS Developer Academy in Naples inside University of Naples Federico II's new campus.[59][60] The course is completely free, aimed at acquiring specific technical skills on the creation and management of applications for the Apple ecosystem platforms.[61] At the academy there are also issues of business administration (business planning and business management with a focus on digital opportunities) and there is a path dedicated to the design of graphical interfaces. Students have the opportunity to participate in the "Enterprise Track", an in-depth training experience on the entire life cycle of an app, from design to implementation, to security, troubleshooting, data storage and cloud usage.[62][63] As of 2020, the academy graduated almost a thousand students from all over the world, who have worked on 400 app ideas and have already published about 50 apps on the iOS App Store. In the 2018–2019 academic year, students from more than 30 countries arrived. 35 of these have been selected to attend the Worldwide Developer Conference, the annual Apple Developer Conference held annually in California in early June.[64][65]

 
Apple CEO Steve Jobs introduces the iPad (2010)

On June 3, 2019, iPadOS, the branded version of iOS for iPad, was announced at the 2019 WWDC; it was launched on September 25, 2019.[66]

Features

Interface

The iOS user interface is based upon direct manipulation, using multi-touch gestures such as swipe, tap, pinch, and reverse pinch. Interface control elements include sliders, switches, and buttons.[67] Internal accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating it in three dimensions (one common result is switching between portrait and landscape mode). Various accessibility described in § Accessibility functions enable users with vision and hearing disabilities to properly use iOS.[68]

iOS devices boot to the homescreen, the primary navigation and information "hub" on iOS devices, analogous to the desktop found on personal computers. iOS homescreens are typically made up of app icons and widgets; app icons launch the associated app, whereas widgets display live, auto-updating content, such as a weather forecast, the user's email inbox, or a news ticker directly on the homescreen.[69]

Along the top of the screen is a status bar, showing information about the device and its connectivity. The status bar itself contains two elements, the Control Center and the Notification Center. The Control Center can be "pulled" down from the top right of the notch, on the new iPhones, giving access to various toggles to manage the device more quickly without having to open the Settings. It is possible to manage brightness, volume, wireless connections, music player, etc.[70]

Instead, scrolling from the top left to the bottom will open the Notification Center, which in the latest versions of iOS is very similar to the lockscreen. It displays notifications in chronological order and groups them by application. From the notifications of some apps it is possible to interact directly, for example by replying a message directly from it. Notifications are sent in two modes, the important notifications that are displayed on the lock screen and signaled by a distinctive sound, accompanied by a warning banner and the app badge icon, and the secondary mode where they are displayed in the Notification Center, but they are not shown on the lock screen, nor are they indicated by warning banners, badge icons or sounds.[71][72]

On earlier iPhones with a home button, screenshots can be created with the simultaneous press of the home and power buttons. In comparison to Android, which requires the buttons to be held down, a short press does suffice on iOS.[73] On the more recent iPhones which lack a physical home button, screenshots are captured using the volume-up and power buttons instead.[74]

The camera application used a skeuomorphic closing camera shutter animation prior to iOS 7. Since then, it uses a simple short blackout effect.[75] Notable additions over time include HDR photography and the option to save both normal and high dynamic range photographs simultaneously where the former prevents ghosting effects from moving objects (since iPhone 5 on iOS 6), automatic HDR adjustment (since iOS 7.1), "live photo" with short video bundled to each photo if enabled (iPhone 6s, iOS 9), and a digital zoom shortcut (iPhone 7 Plus, iOS 10).[76][77][78] Some camera settings such as video resolution and frame rate are not adjustable through the camera interface itself, but are outsourced to the system settings.[79]

A new feature in iOS 13 called "context menus" shows related actions when you touch and hold an item. When the context menu is displayed, the background is blurred.[80]

To choose from a few options, a selection control is used. Selectors can appear anchored at the bottom or in line with the content (called date selectors). Date selectors take on the appearance of any other selection control, but with a column for day, month, and optionally year.

Alerts appear in the center of the screen, but there are also alerts that scroll up from the bottom of the screen (called "action panels"). Destructive actions (such as eliminating any element) are colored red.

The official font of iOS is San Francisco. It is designed for small text readability, and is used throughout the operating system, including third-party apps.[80]

The icons are 180x180px in size for iPhones with a larger screen, usually models over 6 inches, including iPhone 11 Pro and iPhone 8 Plus, while they are 120x120px on iPhones with smaller displays.[81]

Applications

See also: App Store (iOS) and .ipa

iOS devices come with preinstalled apps developed by Apple including Mail, Maps, TV, Music, FaceTime, Wallet, Health, and many more.

Applications ("apps") are the most general form of application software that can be installed on iOS. They are downloaded from the official catalog of the App Store digital store, where apps are subjected to security checks before being made available to users. In June 2017, Apple updated its guidelines to specify that app developers will no longer have the ability to use custom prompts for encouraging users to leave reviews for their apps.[82][83] IOS applications can also be installed directly from an IPA file provided by the software distributor, via unofficial ways. They are written using iOS Software Development Kit (SDK) and, often, combined with Xcode, using officially supported programming languages, including Swift and Objective-C. Other companies have also created tools that allow for the development of native iOS apps using their respective programming languages.

Applications for iOS are mostly built using components of UIKit, a programming framework. It allows applications to have a consistent look and feel with the OS, nevertheless offering customization.

Elements automatically update along with iOS updates, automatically including new interface rules. UIKit elements are very adaptable, this allows developers to design a single app that looks the same on any iOS device. In addition to defining the iOS interface, UIKit defines the functionality of the application.

At first, Apple did not intend to release an SDK to developers, because they did not want third-party apps to be developed for iOS, building web apps instead. However, this technology never entered into common use, this led Apple to change its opinion, so in October 2007 the SDK for developers was announced, finally released on March 6, 2008.

The SDK includes an inclusive set of development tools,[84] including an audio mixer and an iPhone simulator. It is a free download for Mac users. It is not available for Microsoft Windows PCs. To test the application, get technical support, and distribute applications through App Store, developers are required to subscribe to the Apple Developer Program.

Over the years, the Apple Store apps surpassed multiple major milestones, including 50,000,[85] 100,000,[86] 250,000,[87] 500,000,[88] 1 million,[89] and 2 million apps.[90] The billionth application was installed on April 24, 2009.[91]

Home screen

Main article: SpringBoard

The home screen, rendered by SpringBoard, displays application icons and a dock at the bottom where users can pin their most frequently used apps. The home screen appears whenever the user unlocks the device, presses the physical "Home" button while in an app, or swipes up from the bottom of the screen using the home bar.[92] Before iOS 4 on the iPhone 3GS (or later), the screen's background could be customized only through jailbreaking, but can now be changed out-of-the-box. The screen has a status bar across the top to display data, such as time, battery level, and signal strength. The rest of the screen is devoted to the current application. When a passcode is set and a user switches on the device, the passcode must be entered at the Lock Screen before access to the Home screen is granted.[93]

In iPhone OS 3, Spotlight was introduced, allowing users to search media, apps, emails, contacts, messages, reminders, calendar events, and similar content. In iOS 7 and later, Spotlight is accessed by pulling down anywhere on the home screen (except for the top and bottom edges that open Notification Center and Control Center).[94][95] In iOS 9, there are two ways to access Spotlight. As with iOS 7 and 8, pulling down on any homescreen will show Spotlight. However, it can also be accessed as it was in iOS versions 3 through 6. This endows Spotlight with Siri suggestions, which include app suggestions, contact suggestions and news.[96] In iOS 10, Spotlight is at the top of the now-dedicated "Today" panel.[97]

Since iOS 3.2, users are able to set a background image for the Home Screen. This feature is only available on third-generation devices—iPhone 3GS, third-generation iPod Touch (iOS 4.0 or newer), and all iPad models (since iOS 3.2)—or newer.[citation needed]

iOS 7 introduced a parallax effect on the Home Screen, which shifts the device's wallpaper and icons in response to the movement of the device, creating a 3D effect and an illusion of floating icons. This effect is also visible in the tab view of Mail and Safari.[98]

Researchers found that users organize icons on their homescreens based on usage frequency and relatedness of the applications, as well as for reasons of usability and aesthetics.[99]

System font

iOS originally used Helvetica as the system font. Apple switched to Helvetica Neue exclusively for the iPhone 4 and its Retina Display, and retained Helvetica as the system font for older iPhone devices on iOS 4.[100] With iOS 7, Apple announced that they would change the system font to Helvetica Neue Light, a decision that sparked criticism for inappropriate usage of a light, thin typeface for low-resolution mobile screens. Apple eventually chose Helvetica Neue instead.[101][102] The release of iOS 7 also introduced the ability to scale text or apply other forms of text accessibility changes through Settings.[103][104] With iOS 9, Apple changed the font to San Francisco, an Apple-designed font aimed at maximum legibility and font consistency across its product lineup.[105][106]

Folders

iOS 4 introduced folders, which can be created by dragging an application on top of another, and from then on, more items can be added to the folder using the same procedure. A title for the folder is automatically selected by the category of applications inside, but the name can also be edited by the user.[107] When apps inside folders receive notification badges, the individual numbers of notifications are added up and the total number is displayed as a notification badge on the folder itself.[107] Originally, folders on an iPhone could include up to 12 apps, while folders on iPad could include 20.[108] With increasing display sizes on newer iPhone hardware, iOS 7 updated the folders with pages similar to the home screen layout, allowing for a significant expansion of folder functionality. Each page of a folder can contain up to nine apps, and there can be 15 pages in total, allowing for a total of 135 apps in a single folder.[109] In iOS 9, Apple updated folder sizes for iPad hardware, allowing for 16 apps per page, still at 15 pages maximum, increasing the total to 240 apps.[110]

Notification Center

Main article: Notification Center

Before iOS 5, notifications were delivered in a modal window and couldn't be viewed after being dismissed. In iOS 5, Apple introduced Notification Center, which allows users to view a history of notifications. The user can tap a notification to open its corresponding app, or clear it.[111] Notifications are now delivered in banners that appear briefly at the top of the screen. If a user taps a received notification, the application that sent the notification will be opened. Users can also choose to view notifications in modal alert windows by adjusting the application's notification settings. Introduced with iOS 8, widgets are now accessible through the Notification Center, defined by 3rd parties.[citation needed]

When an app sends a notification while closed, a red badge appears on its icon. This badge tells the user, at a glance, how many notifications that app has sent. Opening the app clears the badge.

Accessibility

iOS offers various accessibility features to help users with vision and hearing disabilities. One major feature, VoiceOver, provides a voice reading information on the screen, including contextual buttons, icons, links and other user interface elements, and allows the user to navigate the operating system through gestures. Any apps with default controls and developed with a UIKit framework gets VoiceOver functionality built in.[112] One example includes holding up the iPhone to take a photo, with VoiceOver describing the photo scenery.[113] As part of a "Made for iPhone" program, introduced with the release of iOS 7 in 2013, Apple has developed technology to use Bluetooth and a special technology protocol to let compatible third-party equipment connect with iPhones and iPads for streaming audio directly to a user's ears. Additional customization available for Made for iPhone products include battery tracking and adjustable sound settings for different environments.[114][115] Apple made further efforts for accessibility for the release of iOS 10 in 2016, adding a new pronunciation editor to VoiceOver, adding a Magnifier setting to enlarge objects through the device's camera, software TTY support for deaf people to make phone calls from the iPhone, and giving tutorials and guidelines for third-party developers to incorporate proper accessibility functions into their apps.[116]

In 2012, Liat Kornowski from The Atlantic wrote that "the iPhone has turned out to be one of the most revolutionary developments since the invention of Braille",[117] and in 2016, Steven Aquino of TechCrunch described Apple as "leading the way in assistive technology", with Sarah Herrlinger, Senior Manager for Global Accessibility Policy and Initiatives at Apple, stating that "We see accessibility as a basic human right. Building into the core of our products supports a vision of an inclusive world where opportunity and access to information are barrier-free, empowering individuals with disabilities to achieve their goals".[118]

Criticism has been aimed at iOS depending on both internet connection (either WiFi or through iTunes) and a working SIM card upon first activation.[119] This restriction has been loosened in iOS 12, which no longer requires the latter.[120]

Multitasking

Multitasking for iOS was first released in June 2010 along with the release of iOS 4.[121][122] Only certain devices—iPhone 4, iPhone 3GS, and iPod Touch 3rd generation—were able to multitask.[123] The iPad did not get multitasking until iOS 4.2.1 in that November.[124]

The implementation of multitasking in iOS has been criticized for its approach, which limits the work that applications in the background can perform to a limited function set and requires application developers to add explicit support for it.[123][125]

Before iOS 4, multitasking was limited to a selection of the applications Apple included on the device. Users could however "jailbreak" their device in order to unofficially multitask.[126] Starting with iOS 4, on third-generation and newer iOS devices, multitasking is supported through seven background APIs:[127]

  1. Background audio – application continues to run in the background as long as it is playing audio or video content[128]
  2. Voice over IP – application is suspended when a phone call is not in progress[128]
  3. Background location – application is notified of location changes[128]
  4. Push notifications
  5. Local notifications – application schedules local notifications to be delivered at a predetermined time[128]
  6. Task completion – application asks the system for extra time to complete a given task[128]
  7. Fast app switching – application does not execute any code and may be removed from memory at any time[128]

In iOS 5, three new background APIs were introduced:

  1. Newsstand – application can download content in the background to be ready for the user[128]
  2. External Accessory – application communicates with an external accessory and shares data at regular intervals[128]
  3. Bluetooth Accessory – application communicates with a bluetooth accessory and shares data at regular intervals[128]

In iOS 7, Apple introduced a new multitasking feature, providing all apps with the ability to perform background updates. This feature prefers to update the user's most frequently used apps and prefers to use Wi-Fi networks over a cellular network, without markedly reducing the device's battery life.

Switching applications

In iOS 4.0 to iOS 6.x, double-clicking the home button activates the application switcher. A scrollable dock-style interface appears from the bottom, moving the contents of the screen up. Choosing an icon switches to an application. To the far left are icons which function as music controls, a rotation lock, and on iOS 4.2 and above, a volume controller.

With the introduction of iOS 7, double-clicking the home button also activates the application switcher. However, unlike previous versions it displays screenshots of open applications on top of the icon and horizontal scrolling allows for browsing through previous apps, and it is possible to close applications by dragging them up, similar to how WebOS handled multiple cards.[129]

With the introduction of iOS 9, the application switcher received a significant visual change; while still retaining the card metaphor introduced in iOS 7, the application icon is smaller, and appears above the screenshot (which is now larger, due to the removal of "Recent and Favorite Contacts"), and each application "card" overlaps the other, forming a rolodex effect as the user scrolls. Now, instead of the home screen appearing at the leftmost of the application switcher, it appears rightmost.[130] In iOS 11, the application switcher receives a major redesign. In the iPad, the Control Center and app switcher are combined. The app switcher in the iPad can also be accessed by swiping up from the bottom. In the iPhone, the app switcher cannot be accessed if there are no apps in the RAM.

Ending tasks

In iOS 4.0 to iOS 6.x, briefly holding the icons in the application switcher makes them "jiggle" (similarly to the homescreen) and allows the user to force quit the applications by tapping the red minus circle that appears at the corner of the app's icon.[131] Clearing applications from multitasking stayed the same from iOS 4.0 through 6.1.6, the last version of iOS 6.

As of iOS 7, the process has become faster and easier. In iOS 7, instead of holding the icons to close them, they are closed by simply swiping them upwards off the screen. Up to three apps can be cleared at a time compared to one in versions up to iOS 6.1.6.[132]

Task completion

Task completion allows apps to continue a certain task after the app has been suspended.[133][134] As of iOS 4.0, apps can request up to ten minutes to complete a task in the background.[135] This doesn't extend to background uploads and downloads though (e.g. if a user starts a download in one application, it won't finish if they switch away from the application).

Siri

Main article: Siri

Siri (/ˈsɪri/) is an intelligent personal assistant integrated into iOS. The assistant uses voice queries and a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Internet services. The software adapts to users' individual language usages, searches, and preferences, with continuing use. Returned results are individualized.

Originally released as an app for iOS in February 2010,[136] it was acquired by Apple two months later,[137][138][139] and then integrated into iPhone 4S at its release in October 2011.[140][141] At that time, the separate app was also removed from the iOS App Store.[142]

Siri supports a wide range of user commands, including performing phone actions, checking basic information, scheduling events and reminders, handling device settings, searching the Internet, navigating areas, finding information on entertainment, and is able to engage with iOS-integrated apps.[143] With the release of iOS 10 in 2016, Apple opened up limited third-party access to Siri, including third-party messaging apps, as well as payments, ride-sharing, and Internet calling apps.[144][145] With the release of iOS 11, Apple updated Siri's voices for more clear, human voices, it now supports follow-up questions and language translation, and additional third-party actions.[146][147]

Game Center

Main article: Game Center

Game Center is an online multiplayer "social gaming network"[148] released by Apple.[149] It allows users to "invite friends to play a game, start a multiplayer game through matchmaking, track their achievements, and compare their high scores on a leaderboard." iOS 5 and above adds support for profile photos.[148]

Game Center was announced during an iOS 4 preview event hosted by Apple on April 8, 2010. A preview was released to registered Apple developers in August.[148] It was released on September 8, 2010, with iOS 4.1 on iPhone 4, iPhone 3GS, and iPod Touch 2nd generation through 4th generation.[150] Game Center made its public debut on the iPad with iOS 4.2.1.[151] There is no support for the iPhone 3G, original iPhone and the first-generation iPod Touch (the latter two devices did not have Game Center because they did not get iOS 4).[152] However, Game Center is unofficially available on the iPhone 3G via a hack.[153]

Hardware

The main hardware platform for iOS is the ARM architecture (the ARMv7, ARMv8-A, ARMv8.2-A, ARMv8.3-A). iOS releases before iOS 7 can only be run on iOS devices with 32-bit ARM processors (ARMv6 and ARMv7-A architectures). In 2013, iOS 7 was released with full 64-bit support (which includes a native 64-bit kernel, libraries, drivers as well as all built-in applications),[154] after Apple announced that they were switching to 64-bit ARMv8-A processors with the introduction of the Apple A7 chip.[155] 64-bit support was also enforced for all apps in the App Store; All new apps submitted to the App Store with a deadline of February 2015, and all app updates submitted to the App Store with a deadline of June 1, 2015.[156] iOS 11 drops support for all iOS devices with 32-bit ARM processors as well as 32-bit applications,[157][158] making iOS 64-bit only.[159]

Development

Main article: iOS SDK

The iOS SDK (Software Development Kit) allows for the development of mobile apps on iOS.

While originally developing iPhone prior to its unveiling in 2007, Apple's then-CEO Steve Jobs did not intend to let third-party developers build native apps for iOS, instead directing them to make web applications for the Safari web browser.[160] However, backlash from developers prompted the company to reconsider,[160] with Jobs announcing in October 2007 that Apple would have a software development kit available for developers by February 2008.[161][162] The SDK was released on March 6, 2008.[163][164]

The SDK is a free download for users of Mac personal computers.[165] It is not available for Microsoft Windows PCs.[165] The SDK contains sets giving developers access to various functions and services of iOS devices, such as hardware and software attributes.[166] It also contains an iPhone simulator to mimic the look and feel of the device on the computer while developing.[166] New versions of the SDK accompany new versions of iOS.[167][168] In order to test applications, get technical support, and distribute apps through App Store, developers are required to subscribe to the Apple Developer Program.[165]

Combined with Xcode, the iOS SDK helps developers write iOS apps using officially supported programming languages, including Swift and Objective-C.[169] Other companies have also created tools that allow for the development of native iOS apps using their respective programming languages.[170][171]

Update history & schedule

Main article: iOS version history

iPhone platform usage as measured by the App Store on May 30th, 2023[172]

  iOS 16 (90%)
  iOS 15 (8%)
  iOS 14 and earlier (2%)

iPad platform usage as measured by the App Store on May 30th, 2023[172]

  iPadOS 16 (71%)
  iPadOS 15 (20%)
  iPadOS 14 and earlier (9%)

Apple provides major updates to the iOS operating system annually via iTunes and, since iOS 5, also over-the-air.[173] The device checks an XML-based PLIST file on mesu.apple.com for updates. Updates are delivered as unencrypted ZIP files. Updates are checked for regularly, and are downloaded and installed automatically if enabled. Otherwise, the user can install them manually or are prompted to allow automatic installation overnight if plugged in and connected to Wi-Fi.

iPod Touch users originally had to pay for system software updates due to accounting rules that designated it not a "subscription device" like the iPhone or Apple TV,[174][175] causing many iPod Touch owners not to update.[176] In September 2009, a change in accounting rules won tentative approval, affecting Apple's earnings and stock price, and allowing iPod Touch updates to be delivered free of charge.[177][178]

Apple significantly extended the cycle of updates for iOS-supported devices over the years. The iPhone (1st generation) and iPhone 3G only received two iOS updates, while later models had support for five, six, and seven years.[179][180]

XNU kernel

Main article: XNU

The iOS kernel is the XNU kernel of Darwin. The original iPhone OS (1.0) up to iPhone OS 3.1.3 used Darwin 9.0.0d1. iOS 4 was based on Darwin 10. iOS 5 was based on Darwin 11. iOS 6 was based on Darwin 13. iOS 7 and iOS 8 are based on Darwin 14. iOS 9 is based on Darwin 15. iOS 10 is based on Darwin 16. iOS 11 is based on Darwin 17. iOS 12 is based on Darwin 18. iOS 13 is based on Darwin 19. iOS 14 is based on Darwin 20. iOS 15 is based on Darwin 21. iOS 16 is based on Darwin 22.[181]

In iOS 6 the kernel is subject to ASLR, similar to that of OS X Mountain Lion. This makes exploit possibilities more complex since it is not possible to know the location of kernel code.

Apple has made the XNU kernel open source.[182] The source is under a 3-clause[183] BSD license for the original BSD parts, with parts added by Apple under the Apple Public Source License.[184] The versions contained in iOS are not available; only the versions used in macOS are available.

iOS does not have kernel extensions (kexts) in the file system, even if they are actually present. The kernel cache can be decompressed to show the correct kernel, along with the kexts (all packed in the __PRELINK_TEXT section) and their plists (in the __PRELINK_INFO section).

The kernel cache can also be directly decompressed (if decrypted) using third-party tools. With the advent of iOS 10 betas and default plain text kernelcaches, these tools can only be used after unpacking and applying lzssdec to unpack the kernel cache to its full size.

The kextstat provided by the Cydia alternative software does not work on iOS because the kextstat is based on kmod_get_info(...), which is a deprecated API in iOS 4 and Mac OS X Snow Leopard. There are other alternative software that can also dump raw XML data.

On developing devices, the kernel is always stored as a statically linked cache stored in /System/Library/Caches/com.apple.kernelcaches/kernelcache which is unpacked and executed at boot.

In the beginning, iOS had a kernel version usually higher than the corresponding version of macOS. Over time, the kernels of iOS and macOS have gotten closer. This is not surprising, considering that iOS introduced new features (such as the ASLR Kernel, the default freezer, and various security-strengthening features) that were first incorporated and subsequently arrived on macOS. It appears Apple is gradually merging the iOS and macOS kernels over time. The build date for each version varies slightly between processors. This is due to the fact that the builds are sequential.

Kernel Image

The kernel image base is randomized by the boot loader (iBoot). This is done by creating random data, doing a SHA-1 hash of it and then using a byte from the SHA-1 hash for the kernel slide. The slide is calculated with this formula: 

base=0x01000000+(slide_byte*0x00200000)

If the slide is 0, the static offset of 0x21000000 is used instead.

The adjusted base is passed to the kernel in the boot arguments structure at offset 0x04, which is equivalent to gBootArgs->virtBase.

Kernel Map

The kernel map is used for kernel allocations of all types (kalloc(), kernel_memory_allocate(), etc.) and spans all of kernel space (0x80000000-0xFFFEFFFF). The kernel based maps are submaps of the kernel_map, for example zone_map, ipc_kernel_map, etc.

The strategy is to randomize the base of the kernel_map. A random 9-bit value is generated right after kmem_init() which establishes kernel_map, is multiplied by the page size. The resulting value is used as the size for the initial kernel_map allocation. Future kernel_map (and submap) allocations are pushed forward by a random amount. The allocation is silently removed after the first garbage collection and reused. This behaviour can be overridden with the "kmapoff" boot parameter.

Attacks

Kext_request() allows applications to request information about kernel modules, divided into active and passive operations. Active operations (load, unload, start, stop, etc.) require root access. iOS removes the ability to load kernel extensions. Passive operations were originally (before iOS 6) unrestricted and allowed unprivileged users to query kernel module base addresses. iOS6 inadvertently removed some limitations; only the load address requests are disallowed. So attackers can use kKextRequestPredicateGetLoaded to get load addresses and mach-o header dumps. The load address and mach-o segment headers are obscured to hide the ASLR slide, but mach-o section headers are not. This reveals the virtual addresses of loaded kernel sections.

This information leak has been closed with iOS 6.0.1.

Versions codenames

Main article: List of Apple codenames § iOS

Internally, iOS identifies each version by a codename, often used internally only, normally to maintain secrecy of the project. For example, the codename for iOS 14 is Azul.

Jailbreaking

Main article: iOS jailbreaking

Since its initial release, iOS has been subject to a variety of different hacks centered around adding functionality not allowed by Apple.[185] Prior to the 2008 debut of Apple's native iOS App Store, the primary motive for jailbreaking was to bypass Apple's purchase mechanism for installing the App Store's native applications.[186] Apple claimed that it would not release iOS software updates designed specifically to break these tools (other than applications that perform SIM unlocking); however, with each subsequent iOS update, previously un-patched jailbreak exploits are usually patched.[187]

When a device is booting, it loads Apple's own kernel initially, so a jailbroken device must be exploited and have the kernel patched each time it is booted up.

There are different types of jailbreak. An untethered jailbreak uses exploits that are powerful enough to allow the user to turn their device off and back on at will, with the device starting up completely, and the kernel will be patched without the help of a computer – in other words, it will be jailbroken even after each reboot.

However, some jailbreaks are tethered. A tethered jailbreak is only able to temporarily jailbreak the device during a single boot. If the user turns the device off and then boots it back up without the help of a jailbreak tool, the device will no longer be running a patched kernel, and it may get stuck in a partially started state, such as Recovery Mode. In order for the device to start completely and with a patched kernel, it must be "re-jailbroken" with a computer (using the "boot tethered" feature of a tool) each time it is turned on. All changes to the files on the device (such as installed package files or edited system files) will persist between reboots, including changes that can only function if the device is jailbroken (such as installed package files).

In more recent years, two other solutions have been created – semi-tethered and semi-untethered.

A semi-tethered solution is one where the device is able to start up on its own, but it will no longer have a patched kernel, and therefore will not be able to run modified code. It will, however, still be usable for normal functions, just like stock iOS. To start with a patched kernel, the user must start the device with the help of the jailbreak tool.

A semi-untethered jailbreak gives the ability to start the device on its own. On first boot, the device will not be running a patched kernel. However, rather than having to run a tool from a computer to apply the kernel patches, the user is able to re-jailbreak their device with the help of an app (usually sideloaded using Cydia Impactor) running on their device. In the case of the iOS 9.2-9.3.3 and 64-bit 10.x jailbreaks, Safari-based exploits were available, thereby meaning websites could be used to rejailbreak.

In more detail: Each iOS device has a bootchain that tries to make sure only trusted/signed code is loaded. A device with a tethered jailbreak is able to boot up with the help of a jailbreaking tool because the tool executes exploits via USB that bypass parts of that "chain of trust", bootstrapping to a pwned (no signature check) iBSS, iBEC, or iBoot to finish the boot process.

Since the arrival of Apple's native iOS App Store, and—along with it—third-party applications, the general motives for jailbreaking have changed.[188] People jailbreak for many different reasons, including gaining filesystem access, installing custom device themes, and modifying SpringBoard. An additional motivation is that it may enable the installation of pirated apps. On some devices, jailbreaking also makes it possible to install alternative operating systems, such as Android and the Linux kernel. Primarily, users jailbreak their devices because of the limitations of iOS. Depending on the method used, the effects of jailbreaking may be permanent or temporary.[189]

In 2010, the Electronic Frontier Foundation (EFF) successfully convinced the U.S. Copyright Office to allow an exemption to the general prohibition on circumvention of copyright protection systems under the Digital Millennium Copyright Act (DMCA). The exemption allows jailbreaking of iPhones for the sole purpose of allowing legally obtained applications to be added to the iPhone.[190] The exemption does not affect the contractual relations between Apple and an iPhone owner, for example, jailbreaking voiding the iPhone warranty; however, it is solely based on Apple's discretion on whether they will fix jailbroken devices in the event that they need to be repaired. At the same time, the Copyright Office exempted unlocking an iPhone from DMCA's anticircumvention prohibitions.[191] Unlocking an iPhone allows the iPhone to be used with any wireless carrier using the same GSM or CDMA technology for which the particular phone model was designed to operate.[192]

Unlocking

Main article: SIM lock

Initially most wireless carriers in the US did not allow iPhone owners to unlock it for use with other carriers. However AT&T allowed iPhone owners who had satisfied contract requirements to unlock their iPhone.[193] Instructions to unlock the device are available from Apple,[194] but it is ultimately at the sole discretion of the carrier to authorize unlocking the device.[195] This allows the use of a carrier-sourced iPhone on other networks. Modern versions of iOS and the iPhone fully support LTE across multiple carriers wherever the phone was purchased.[196] Programs to remove SIM lock restrictions are available, but are not supported by Apple, and most often not a permanent unlock – a soft unlock,[197] which modifies the iPhone so that the baseband will accept the SIM card of any GSM carrier. SIM unlocking is not jailbreaking, but a jailbreak is also required for these unofficial software unlocks.

The legality of software unlocking varies in each country; for example, in the US, there is a DMCA exemption for unofficial software unlocking of devices purchased before January 26, 2013.[198]

Digital rights management

The closed and proprietary nature of iOS has garnered criticism, particularly by digital rights advocates such as the Electronic Frontier Foundation, computer engineer and activist Brewster Kahle, Internet-law specialist Jonathan Zittrain, and the Free Software Foundation who protested the iPad's introductory event and have targeted the iPad with their "Defective by Design" campaign.[199][200][201][202] Competitor Microsoft, via a PR spokesman, criticized Apple's control over its platform.[203]

At issue are restrictions imposed by the design of iOS, namely digital rights management (DRM) intended to lock purchased media to Apple's platform, the development model (requiring a yearly subscription to distribute apps developed for the iOS), the centralized approval process for apps, as well as Apple's general control and lockdown of the platform itself. Particularly at issue is the ability for Apple to remotely disable or delete apps at will.

Some in the tech community have expressed concern that the locked-down iOS represents a growing trend in Apple's approach to computing, particularly Apple's shift away from machines that hobbyists can "tinker with" and note the potential for such restrictions to stifle software innovation.[204][205] Former Facebook developer Joe Hewitt protested against Apple's control over its hardware as a "horrible precedent" but praised iOS's sandboxing of apps.[206]

Security and privacy

See also: Mobile security, WARRIOR PRIDE, and Pegasus (spyware)

iOS utilizes many security features in both hardware and software. Below are summaries of the most prominent features.

Secure Boot

Before fully booting into iOS, there is low-level code that runs from the Boot ROM. Its task is to verify that the Low-Level Bootloader is signed by the Apple Root CA public key before running it. This process is to ensure that no malicious or otherwise unauthorized software can be run on an iOS device. After the Low-Level Bootloader finishes its tasks, it runs the higher level bootloader, known as iBoot. If all goes well, iBoot will then proceed to load the iOS kernel as well as the rest of the operating system.[207]

Secure Enclave

The Secure Enclave is a coprocessor found in iOS devices part of the A7 and newer chips used for data protection. It includes the user data pertaining to Touch ID, Face ID, and Apple Pay, among other sensitive data.[208] The purpose of the Secure Enclave is to handle keys and other info such as biometrics that is sensitive enough to not be handled by the Application Processor (AP). It is isolated with a hardware filter so the AP cannot access it.[208] It shares RAM with the AP, but its portion of the RAM (known as TZ0) is encrypted. The secure enclave itself is a flashable 4 MB AKF processor core called the secure enclave processor (SEP) as documented in Apple Patent Application 20130308838 December 12, 2020, at the Wayback Machine. The technology used is similar to ARM's TrustZone/SecurCore but contains proprietary code for Apple KF cores in general and SEP specifically. It is also responsible for generating the UID key on A9 or newer chips that protects user data at rest.[citation needed]

It has its own secure boot process to ensure that it is completely secure. A hardware random number generator is also included as a part of this coprocessor. Each device's Secure Enclave has a unique ID that is given to it when it is made and cannot be changed. This identifier is used to create a temporary key that encrypts the memory in this portion of the system. The Secure Enclave also contains an anti-replay counter to prevent brute force attacks.[207]

The SEP is located in the devicetree under IODeviceTree:/arm-io/sep and managed by the AppleSEPManager driver.[209]

In 2020, security flaws in the SEP were discovered, causing concerns about Apple devices such as iPhones.[210]

Face ID

Main article: Face ID

Face ID is a face scanner that is embedded in the notch on iPhone models X, XS, XS Max, XR, 11, 11 Pro, 11 Pro Max, 12, 12 Mini, 12 Pro, 12 Pro Max, 13, 13 Mini, 13 Pro, 13 Pro Max, 14, and the 14 Plus. On the iPhone 14 Pro and the 14 Pro Max, it is embedded in the Dynamic Island.[211] It can be used to unlock the device, make purchases, and log into applications among other functions. When used, Face ID only temporarily stores the face data in encrypted memory in the Secure Enclave, as described above. There is no way for the device's main processor or any other part of the system to access the raw data that is obtained from the Face ID sensor.[207]

Passcode

iOS devices can have a passcode that is used to unlock the device, make changes to system settings, and encrypt the device's contents. Until recently, these were typically four numerical digits long. However, since unlocking the devices with a fingerprint by using Touch ID has become more widespread, six-digit passcodes are now the default on iOS with the option to switch back to four or use an alphanumeric passcode.[207]

Touch ID

Main article: Touch ID

Touch ID is a fingerprint scanner that is embedded in the home button and can be used to unlock the device, make purchases, and log into applications among other functions. When used, Touch ID only temporarily stores the fingerprint data in encrypted memory in the Secure Enclave, as described above. Like Face ID, there is no way for the device's main processor or any other part of the system to access the raw fingerprint data that is obtained from the Touch ID sensor.[207]

Address Space Layout Randomization

Main article: Address Space Layout Randomization

Address Space Layout Randomization (ASLR) is a low-level technique of preventing memory corruption attacks such as buffer overflows. It involves placing data in randomly selected locations in memory in order to make it more difficult to predict ways to corrupt the system and create exploits. ASLR makes app bugs more likely to crash the app than to silently overwrite memory, regardless of whether the behavior is accidental or malicious.[212]

Non-executable memory

iOS utilizes the ARM architecture's Execute Never (XN) feature. This allows some portions of the memory to be marked as non-executable, working alongside ASLR to prevent buffer overflow attacks including return-to-libc attacks.[207]

Encryption

As mentioned above, one use of encryption in iOS is in the memory of the Secure Enclave. When a passcode is utilized on an iOS device, the contents of the device are encrypted. This is done by using a hardware AES 256 implementation that is very efficient because it is placed directly between the flash storage and RAM.[207]

iOS, in combination with its specific hardware, uses crypto-shredding when erasing all content and settings by obliterating all the keys in 'effaceable storage'. This renders all user data on the device cryptographically inaccessible.[213]

Keychain

See also: iCloud § iCloud Keychain

The iOS keychain is a database of login information that can be shared across apps written by the same person or organization.[207] This service is often used for storing passwords for web applications.[214]

App security

Third-party applications such as those distributed through the App Store must be code signed with an Apple-issued certificate. In principle, this continues the chain of trust all the way from the Secure Boot process as mentioned above to the actions of the applications installed on the device by users. Applications are also sandboxed, meaning that they can only modify the data within their individual home directory unless explicitly given permission to do otherwise. For example, they cannot access data owned by other user-installed applications on the device. There is a very extensive set of privacy controls contained within iOS with options to control apps' ability to access a wide variety of permissions such as the camera, contacts, background app refresh, cellular data, and access to other data and services. Most of the code in iOS, including third-party applications, runs as the "mobile" user which does not have root privileges. This ensures that system files and other iOS system resources remain hidden and inaccessible to user-installed applications.[207]

App Store bypasses

Companies can apply to Apple for enterprise developer certificates. These can be used to sign apps such that iOS will install them directly (sometimes called "sideloading"), without the app needing to be distributed via the App Store.[215] The terms under which they are granted make clear that they are only to be used for companies who wish to distribute apps directly to their employees.[215]

Circa January–February 2019, it emerged that a number of software developers were misusing enterprise developer certificates to distribute software directly to non-employees, thereby bypassing the App Store. Facebook was found to be abusing an Apple enterprise developer certificate to distribute an application to underage users that would give Facebook access to all private data on their devices.[216][217][218] Google was abusing an Apple enterprise developer certificate to distribute an app to adults to collect data from their devices, including unencrypted data belonging to third parties.[219][215] TutuApp, Panda Helper, AppValley, and TweakBox have all been abusing enterprise developer certificates to distribute apps that offer pirated software.[220]

Network security

iOS supports TLS with both low- and high-level APIs for developers. By default, the App Transport Security framework requires that servers use at least TLS 1.2. However, developers are free to override this framework and utilize their own methods of communicating over networks. When Wi-Fi is enabled, iOS uses a randomized MAC address so that devices cannot be tracked by anyone sniffing wireless traffic.[207]

Two-factor authentication

Main article: Multi-factor authentication

Two-factor authentication is an option in iOS to ensure that even if an unauthorized person knows an Apple ID and password combination, they cannot gain access to the account. It works by requiring not only the Apple ID and password, but also a verification code that is sent to an iDevice or mobile phone number that is already known to be trusted.[207] If an unauthorized user attempts to sign in using another user's Apple ID, the owner of the Apple ID receives a notification that allows them to deny access to the unrecognized device.[221]

Hardened memory allocation

iOS features a hardened memory allocator known as kalloc_type that was introduced in iOS 15. Since the XNU kernel is primarily written in memory unsafe languages such as C and C++,[222] kalloc_type is designed to mitigate the large amount of vulnerabilities that result from the use of these languages in the kernel. In order to achieve this, kalloc_type implements mitigations such as type isolation in order to prevent type confusion and buffer overflow vulnerabilities. Ultimately, the prevention of privilege escalation is intended.[223]

Reception

Market share

See also: Usage share of operating systems
Worldwide market share of smartphone operating systems
Android
 
 68.61%
iOS
 
 30.61%
Other
 
 0.78%
Source: Statcounter (April 2023).[224]

iOS is the second most popular mobile operating system in the world, after Android. Sales of iPads in recent years are also behind Android, while, by web use (a proxy for all use), iPads (using iOS) are still the most popular.[225]

By the middle of 2012, there were 410 million devices activated.[226] At WWDC 2014, Tim Cook said 800 million devices had been sold by June 2014.[227]

During Apple's quarterly earnings call in January 2015, the company announced that they had sold over one billion iOS devices since 2007.[228][229]

By late 2011, iOS accounted for 60% of the market share for smartphones and tablets.[230] By the end of 2014, iOS accounted for 14.8% of the smartphone market[231] and 27.6% of the tablet and two-in-one market.[232] In February 2015, StatCounter reported iOS was used on 23.18% of smartphones and 66.25% of tablets worldwide, measured by internet usage instead of sales.[233]

In the third quarter of 2015, research from Strategy Analytics showed that iOS adoption of the worldwide smartphone market was at a record low 12.1%, attributed to lackluster performance in China and Africa. Android accounted for 87.5% of the market, with Windows Phone and BlackBerry accounting for the rest.[234][235]

Devices

Main article: List of iPhone models
Timeline of iOS devices: iPhone, iPod Touch, iPad, and Apple TV (2G) models
Apple Watch Ultra 2Apple Watch UltraApple Watch Series 9Apple Watch Series 8Apple Watch Series 7Apple Watch Series 6Apple Watch Series 5Apple Watch SEApple Watch Series 4Apple Watch Series 3Apple Watch SEApple Watch Series 2Apple Watch Series 1Apple WatchApple TVApple TVApple TVApple TVApple TVApple TVApple TVApple TV (1st)iPad ProiPad ProiPad ProiPad ProiPad ProiPad ProiPad ProiPad ProiPad ProiPad ProiPad ProiPad ProiPad Air (5th generation)iPad Air (4th generation)iPad Air (3rd generation)iPad Air 2iPad AiriPad Mini (6th generation)iPad Mini (5th generation)iPad Mini 4iPad Mini 3iPad Mini 2iPad Mini (1st generation)iPad (10th generation)iPad (9th generation)iPad (8th generation)iPad (7th generation)iPad (6th generation)iPad (5th generation)iPad (4th generation)iPad (4th generation)iPad (3rd generation)iPad (2nd generation)iPad (1st generation)iPod Touch (7th generation)iPod Touch (6th generation)iPod Touch (5th generation)iPod Touch (4th generation)iPod Touch#ModelsiPod Touch#ModelsiPod Touch#ModelsiPhone SE (3rd generation)iPhone 15 ProiPhone 15iPhone 14 ProiPhone 14iPhone 13 ProiPhone 13iPhone 13iPhone 12 ProiPhone 12 ProiPhone 12iPhone 12iPhone 11 ProiPhone 11iPhone XRiPhone XSiPhone SE (2nd generation)iPhone XiPhone 8iPhone 7iPhone 6SiPhone 6iPhone SE (1st generation)iPhone 6iPhone 5CiPhone 5SiPhone 5iPhone 4SiPhone 4iPhone 3GSiPhone 3GiPhone (1st generation)
Sources: Apple Inc. Newsroom Archive,[236] Mactracker Apple Inc. model database[237]
See also: Timeline of Apple Inc. products, iOS version history, and iPod § Timeline of iPod models

See also

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External links

 
Wikimedia Commons has media related to IOS (Apple Inc.).
  • Official website
  • Official website Dev Center at Apple Developer Connection
  • iOS Reference Library – on the Apple Developer Connection website

October 15, 2023
other, uses, disambiguation, confused, with, operating, system, developed, tecno, mobile, formerly, iphone, mobile, operating, system, developed, apple, exclusively, hardware, operating, system, that, powers, many, company, mobile, devices, including, iphone, . For other uses see IOS disambiguation Not to be confused with HiOS an operating system developed by Tecno Mobile iOS formerly iPhone OS 5 is a mobile operating system developed by Apple Inc exclusively for its hardware It is the operating system that powers many of the company s mobile devices including the iPhone the term also includes the system software for iPads predating iPadOS which was introduced in 2019 as well as on the iPod Touch devices which were discontinued in mid 2022 6 It is the world s second most widely installed mobile operating system after Android It is the basis for three other operating systems made by Apple iPadOS tvOS and watchOS 7 It is proprietary software although some parts of it are open source under the Apple Public Source License and other licenses 8 iOSCommercial logo as used by Apple since 2017iOS 17 home screenDeveloperApple Inc Written inC C Objective C Swift assembly languageOS familyUnix like based on Darwin BSD macOSWorking stateCurrentSource modelClosed with open source componentsInitial releaseJune 29 2007 16 years ago 2007 06 29 Latest release17 0 3 1 October 4 2023 11 days ago 2023 10 04 Latest preview17 1 beta 2 2 October 3 2023 12 days ago 2023 10 03 Marketing targetSmartphones tablet computers portable media playersAvailable in41 languages 3 List of languagesArabic Bulgarian Catalan Chinese Simplified Chinese Traditional Hong Kong Chinese Traditional Taiwan Croatian Czech Danish Dutch English Australia English United Kingdom English United States Finnish French Canada French France German Greek Hebrew Hindi Hungarian Indonesian Italian Japanese Kazakh Korean Malay Norwegian Polish Portuguese Brazil Portuguese Portugal Romanian Russian Slovak Spanish Latin America Spanish Spain Swedish Thai Turkish Ukrainian VietnameseUpdate methodOTA since iOS 5 Finder from macOS Catalina onwards 4 or iTunes Windows and macOS pre Catalina PlatformsARMv8 A iOS 7 and later ARMv7 A iPhone OS 3 iOS 10 3 4 ARMv6 iPhone OS 1 iOS 4 2 1 Kernel typeHybrid XNU Defaultuser interfaceMulti touch graphical user interfaceLicenseProprietary software except for open source componentsOfficial websiteapple com iosSupport statusSupportedArticles in the seriesiOS version historyUnveiled in 2007 for the first generation iPhone iOS has since been extended to support other Apple devices such as the iPod Touch September 2007 and the iPad introduced January 2010 availability April 2010 As of March 2018 update Apple s App Store contains more than 2 1 million iOS applications 1 million of which are native for iPads 9 These mobile apps have collectively been downloaded more than 130 billion times Major versions of iOS are released annually The current stable version iOS 17 was released to the public on September 18 2023 10 Contents 1 History 2 Features 2 1 Interface 2 2 Applications 2 3 Home screen 2 3 1 System font 2 3 2 Folders 2 3 3 Notification Center 2 4 Accessibility 2 5 Multitasking 2 5 1 Switching applications 2 5 2 Ending tasks 2 5 3 Task completion 2 6 Siri 2 7 Game Center 3 Hardware 4 Development 4 1 Update history amp schedule 4 2 XNU kernel 4 3 Kernel Image 4 4 Kernel Map 4 5 Attacks 4 6 Versions codenames 4 7 Jailbreaking 4 8 Unlocking 5 Digital rights management 6 Security and privacy 6 1 Secure Boot 6 2 Secure Enclave 6 3 Face ID 6 4 Passcode 6 5 Touch ID 6 6 Address Space Layout Randomization 6 7 Non executable memory 6 8 Encryption 6 9 Keychain 6 10 App security 6 10 1 App Store bypasses 6 11 Network security 6 12 Two factor authentication 6 13 Hardened memory allocation 7 Reception 7 1 Market share 8 Devices 9 See also 10 References 11 External linksHistorySee also iOS version history In 2005 when Steve Jobs began planning the iPhone he had a choice to either shrink the Mac which would be an epic feat of engineering or enlarge the iPod Jobs favored the former approach but pitted the Macintosh and iPod teams led by Scott Forstall and Tony Fadell respectively against each other in an internal competition with Forstall winning by creating the iPhone OS The decision enabled the success of the iPhone as a platform for third party developers using a well known desktop operating system as its basis allowed the many third party Mac developers to write software for the iPhone with minimal retraining Forstall was also responsible for creating a software development kit for programmers to build iPhone apps as well as an App Store within iTunes 11 12 The operating system was unveiled with the iPhone at the Macworld Conference amp Expo on January 9 2007 and released in June of that year 13 14 15 At the time of its unveiling in January Steve Jobs claimed iPhone runs OS X and runs desktop class applications 16 17 but at the time of the iPhone s release the operating system was renamed iPhone OS 18 Initially third party native applications were not supported Jobs reasoning was that developers could build web applications through the Safari web browser that would behave like native apps on the iPhone 19 20 In October 2007 Apple announced that a native Software Development Kit SDK was under development and that they planned to put it in developers hands in February 21 22 23 On March 6 2008 Apple held a press event announcing the iPhone SDK 24 25 nbsp iPhone first generation the first commercially released device running iOS 2007 The iOS App Store was opened on July 10 2008 with an initial 500 applications available 26 This quickly grew to 3 000 in September 2008 27 15 000 in January 2009 28 50 000 in June 2009 29 100 000 in November 2009 30 31 250 000 in August 2010 32 33 650 000 in July 2012 34 1 million in October 2013 35 36 2 million in June 2016 37 38 39 and 2 2 million in January 2017 40 41 As of March 2016 update 1 million apps are natively compatible with the iPad tablet computer 42 These apps have collectively been downloaded more than 130 billion times 37 App intelligence firm Sensor Tower estimated that the App Store would reach 5 million apps by 2020 43 In September 2007 Apple announced the iPod Touch a redesigned iPod based on the iPhone form factor 44 On January 27 2010 Apple introduced their much anticipated media tablet the iPad featuring a larger screen than the iPhone and iPod Touch and designed for web browsing media consumption and reading and offering multi touch interaction with multimedia formats including newspapers e books photos videos music word processing documents video games and most existing iPhone apps using a 9 7 inch 25 cm screen 45 46 47 It also includes a mobile version of Safari for web browsing as well as access to the App Store iTunes Library iBookstore Contacts and Notes Content is downloadable via Wi Fi and optional 3G service or synced through the user s computer 48 AT amp T was initially the sole U S provider of 3G wireless access for the iPad 49 In June 2010 Apple rebranded iPhone OS as iOS 50 51 The trademark IOS had been used by Cisco for over a decade for its operating system IOS used on its routers To avoid any potential lawsuit Apple licensed the IOS trademark from Cisco 52 The Apple Watch smartwatch was announced by Tim Cook on September 9 2014 being introduced as a product with health and fitness tracking 53 54 It was released on April 24 2015 55 56 57 It uses watchOS as its operating system watchOS is based on iOS with new features created specially for the Apple Watch such as an activity tracking app 58 In October 2016 Apple opened its first iOS Developer Academy in Naples inside University of Naples Federico II s new campus 59 60 The course is completely free aimed at acquiring specific technical skills on the creation and management of applications for the Apple ecosystem platforms 61 At the academy there are also issues of business administration business planning and business management with a focus on digital opportunities and there is a path dedicated to the design of graphical interfaces Students have the opportunity to participate in the Enterprise Track an in depth training experience on the entire life cycle of an app from design to implementation to security troubleshooting data storage and cloud usage 62 63 As of 2020 the academy graduated almost a thousand students from all over the world who have worked on 400 app ideas and have already published about 50 apps on the iOS App Store In the 2018 2019 academic year students from more than 30 countries arrived 35 of these have been selected to attend the Worldwide Developer Conference the annual Apple Developer Conference held annually in California in early June 64 65 nbsp Apple CEO Steve Jobs introduces the iPad 2010 On June 3 2019 iPadOS the branded version of iOS for iPad was announced at the 2019 WWDC it was launched on September 25 2019 66 FeaturesInterface The iOS user interface is based upon direct manipulation using multi touch gestures such as swipe tap pinch and reverse pinch Interface control elements include sliders switches and buttons 67 Internal accelerometers are used by some applications to respond to shaking the device one common result is the undo command or rotating it in three dimensions one common result is switching between portrait and landscape mode Various accessibility described in Accessibility functions enable users with vision and hearing disabilities to properly use iOS 68 iOS devices boot to the homescreen the primary navigation and information hub on iOS devices analogous to the desktop found on personal computers iOS homescreens are typically made up of app icons and widgets app icons launch the associated app whereas widgets display live auto updating content such as a weather forecast the user s email inbox or a news ticker directly on the homescreen 69 Along the top of the screen is a status bar showing information about the device and its connectivity The status bar itself contains two elements the Control Center and the Notification Center The Control Center can be pulled down from the top right of the notch on the new iPhones giving access to various toggles to manage the device more quickly without having to open the Settings It is possible to manage brightness volume wireless connections music player etc 70 Instead scrolling from the top left to the bottom will open the Notification Center which in the latest versions of iOS is very similar to the lockscreen It displays notifications in chronological order and groups them by application From the notifications of some apps it is possible to interact directly for example by replying a message directly from it Notifications are sent in two modes the important notifications that are displayed on the lock screen and signaled by a distinctive sound accompanied by a warning banner and the app badge icon and the secondary mode where they are displayed in the Notification Center but they are not shown on the lock screen nor are they indicated by warning banners badge icons or sounds 71 72 On earlier iPhones with a home button screenshots can be created with the simultaneous press of the home and power buttons In comparison to Android which requires the buttons to be held down a short press does suffice on iOS 73 On the more recent iPhones which lack a physical home button screenshots are captured using the volume up and power buttons instead 74 The camera application used a skeuomorphic closing camera shutter animation prior to iOS 7 Since then it uses a simple short blackout effect 75 Notable additions over time include HDR photography and the option to save both normal and high dynamic range photographs simultaneously where the former prevents ghosting effects from moving objects since iPhone 5 on iOS 6 automatic HDR adjustment since iOS 7 1 live photo with short video bundled to each photo if enabled iPhone 6s iOS 9 and a digital zoom shortcut iPhone 7 Plus iOS 10 76 77 78 Some camera settings such as video resolution and frame rate are not adjustable through the camera interface itself but are outsourced to the system settings 79 A new feature in iOS 13 called context menus shows related actions when you touch and hold an item When the context menu is displayed the background is blurred 80 To choose from a few options a selection control is used Selectors can appear anchored at the bottom or in line with the content called date selectors Date selectors take on the appearance of any other selection control but with a column for day month and optionally year Alerts appear in the center of the screen but there are also alerts that scroll up from the bottom of the screen called action panels Destructive actions such as eliminating any element are colored red The official font of iOS is San Francisco It is designed for small text readability and is used throughout the operating system including third party apps 80 The icons are 180x180px in size for iPhones with a larger screen usually models over 6 inches including iPhone 11 Pro and iPhone 8 Plus while they are 120x120px on iPhones with smaller displays 81 Applications See also App Store iOS and ipa iOS devices come with preinstalled apps developed by Apple including Mail Maps TV Music FaceTime Wallet Health and many more Applications apps are the most general form of application software that can be installed on iOS They are downloaded from the official catalog of the App Store digital store where apps are subjected to security checks before being made available to users In June 2017 Apple updated its guidelines to specify that app developers will no longer have the ability to use custom prompts for encouraging users to leave reviews for their apps 82 83 IOS applications can also be installed directly from an IPA file provided by the software distributor via unofficial ways They are written using iOS Software Development Kit SDK and often combined with Xcode using officially supported programming languages including Swift and Objective C Other companies have also created tools that allow for the development of native iOS apps using their respective programming languages Applications for iOS are mostly built using components of UIKit a programming framework It allows applications to have a consistent look and feel with the OS nevertheless offering customization Elements automatically update along with iOS updates automatically including new interface rules UIKit elements are very adaptable this allows developers to design a single app that looks the same on any iOS device In addition to defining the iOS interface UIKit defines the functionality of the application At first Apple did not intend to release an SDK to developers because they did not want third party apps to be developed for iOS building web apps instead However this technology never entered into common use this led Apple to change its opinion so in October 2007 the SDK for developers was announced finally released on March 6 2008 The SDK includes an inclusive set of development tools 84 including an audio mixer and an iPhone simulator It is a free download for Mac users It is not available for Microsoft Windows PCs To test the application get technical support and distribute applications through App Store developers are required to subscribe to the Apple Developer Program Over the years the Apple Store apps surpassed multiple major milestones including 50 000 85 100 000 86 250 000 87 500 000 88 1 million 89 and 2 million apps 90 The billionth application was installed on April 24 2009 91 Home screen Main article SpringBoard The home screen rendered by SpringBoard displays application icons and a dock at the bottom where users can pin their most frequently used apps The home screen appears whenever the user unlocks the device presses the physical Home button while in an app or swipes up from the bottom of the screen using the home bar 92 Before iOS 4 on the iPhone 3GS or later the screen s background could be customized only through jailbreaking but can now be changed out of the box The screen has a status bar across the top to display data such as time battery level and signal strength The rest of the screen is devoted to the current application When a passcode is set and a user switches on the device the passcode must be entered at the Lock Screen before access to the Home screen is granted 93 In iPhone OS 3 Spotlight was introduced allowing users to search media apps emails contacts messages reminders calendar events and similar content In iOS 7 and later Spotlight is accessed by pulling down anywhere on the home screen except for the top and bottom edges that open Notification Center and Control Center 94 95 In iOS 9 there are two ways to access Spotlight As with iOS 7 and 8 pulling down on any homescreen will show Spotlight However it can also be accessed as it was in iOS versions 3 through 6 This endows Spotlight with Siri suggestions which include app suggestions contact suggestions and news 96 In iOS 10 Spotlight is at the top of the now dedicated Today panel 97 Since iOS 3 2 users are able to set a background image for the Home Screen This feature is only available on third generation devices iPhone 3GS third generation iPod Touch iOS 4 0 or newer and all iPad models since iOS 3 2 or newer citation needed iOS 7 introduced a parallax effect on the Home Screen which shifts the device s wallpaper and icons in response to the movement of the device creating a 3D effect and an illusion of floating icons This effect is also visible in the tab view of Mail and Safari 98 Researchers found that users organize icons on their homescreens based on usage frequency and relatedness of the applications as well as for reasons of usability and aesthetics 99 System font iOS originally used Helvetica as the system font Apple switched to Helvetica Neue exclusively for the iPhone 4 and its Retina Display and retained Helvetica as the system font for older iPhone devices on iOS 4 100 With iOS 7 Apple announced that they would change the system font to Helvetica Neue Light a decision that sparked criticism for inappropriate usage of a light thin typeface for low resolution mobile screens Apple eventually chose Helvetica Neue instead 101 102 The release of iOS 7 also introduced the ability to scale text or apply other forms of text accessibility changes through Settings 103 104 With iOS 9 Apple changed the font to San Francisco an Apple designed font aimed at maximum legibility and font consistency across its product lineup 105 106 Folders iOS 4 introduced folders which can be created by dragging an application on top of another and from then on more items can be added to the folder using the same procedure A title for the folder is automatically selected by the category of applications inside but the name can also be edited by the user 107 When apps inside folders receive notification badges the individual numbers of notifications are added up and the total number is displayed as a notification badge on the folder itself 107 Originally folders on an iPhone could include up to 12 apps while folders on iPad could include 20 108 With increasing display sizes on newer iPhone hardware iOS 7 updated the folders with pages similar to the home screen layout allowing for a significant expansion of folder functionality Each page of a folder can contain up to nine apps and there can be 15 pages in total allowing for a total of 135 apps in a single folder 109 In iOS 9 Apple updated folder sizes for iPad hardware allowing for 16 apps per page still at 15 pages maximum increasing the total to 240 apps 110 Notification Center Main article Notification Center This section needs additional citations for verification Please help improve this article by adding citations to reliable sources in this section Unsourced material may be challenged and removed Find sources IOS news newspapers books scholar JSTOR November 2022 Learn how and when to remove this template message Before iOS 5 notifications were delivered in a modal window and couldn t be viewed after being dismissed In iOS 5 Apple introduced Notification Center which allows users to view a history of notifications The user can tap a notification to open its corresponding app or clear it 111 Notifications are now delivered in banners that appear briefly at the top of the screen If a user taps a received notification the application that sent the notification will be opened Users can also choose to view notifications in modal alert windows by adjusting the application s notification settings Introduced with iOS 8 widgets are now accessible through the Notification Center defined by 3rd parties citation needed When an app sends a notification while closed a red badge appears on its icon This badge tells the user at a glance how many notifications that app has sent Opening the app clears the badge Accessibility iOS offers various accessibility features to help users with vision and hearing disabilities One major feature VoiceOver provides a voice reading information on the screen including contextual buttons icons links and other user interface elements and allows the user to navigate the operating system through gestures Any apps with default controls and developed with a UIKit framework gets VoiceOver functionality built in 112 One example includes holding up the iPhone to take a photo with VoiceOver describing the photo scenery 113 As part of a Made for iPhone program introduced with the release of iOS 7 in 2013 Apple has developed technology to use Bluetooth and a special technology protocol to let compatible third party equipment connect with iPhones and iPads for streaming audio directly to a user s ears Additional customization available for Made for iPhone products include battery tracking and adjustable sound settings for different environments 114 115 Apple made further efforts for accessibility for the release of iOS 10 in 2016 adding a new pronunciation editor to VoiceOver adding a Magnifier setting to enlarge objects through the device s camera software TTY support for deaf people to make phone calls from the iPhone and giving tutorials and guidelines for third party developers to incorporate proper accessibility functions into their apps 116 In 2012 Liat Kornowski from The Atlantic wrote that the iPhone has turned out to be one of the most revolutionary developments since the invention of Braille 117 and in 2016 Steven Aquino of TechCrunch described Apple as leading the way in assistive technology with Sarah Herrlinger Senior Manager for Global Accessibility Policy and Initiatives at Apple stating that We see accessibility as a basic human right Building into the core of our products supports a vision of an inclusive world where opportunity and access to information are barrier free empowering individuals with disabilities to achieve their goals 118 Criticism has been aimed at iOS depending on both internet connection either WiFi or through iTunes and a working SIM card upon first activation 119 This restriction has been loosened in iOS 12 which no longer requires the latter 120 Multitasking Multitasking for iOS was first released in June 2010 along with the release of iOS 4 121 122 Only certain devices iPhone 4 iPhone 3GS and iPod Touch 3rd generation were able to multitask 123 The iPad did not get multitasking until iOS 4 2 1 in that November 124 The implementation of multitasking in iOS has been criticized for its approach which limits the work that applications in the background can perform to a limited function set and requires application developers to add explicit support for it 123 125 Before iOS 4 multitasking was limited to a selection of the applications Apple included on the device Users could however jailbreak their device in order to unofficially multitask 126 Starting with iOS 4 on third generation and newer iOS devices multitasking is supported through seven background APIs 127 Background audio application continues to run in the background as long as it is playing audio or video content 128 Voice over IP application is suspended when a phone call is not in progress 128 Background location application is notified of location changes 128 Push notifications Local notifications application schedules local notifications to be delivered at a predetermined time 128 Task completion application asks the system for extra time to complete a given task 128 Fast app switching application does not execute any code and may be removed from memory at any time 128 In iOS 5 three new background APIs were introduced Newsstand application can download content in the background to be ready for the user 128 External Accessory application communicates with an external accessory and shares data at regular intervals 128 Bluetooth Accessory application communicates with a bluetooth accessory and shares data at regular intervals 128 In iOS 7 Apple introduced a new multitasking feature providing all apps with the ability to perform background updates This feature prefers to update the user s most frequently used apps and prefers to use Wi Fi networks over a cellular network without markedly reducing the device s battery life Switching applications In iOS 4 0 to iOS 6 x double clicking the home button activates the application switcher A scrollable dock style interface appears from the bottom moving the contents of the screen up Choosing an icon switches to an application To the far left are icons which function as music controls a rotation lock and on iOS 4 2 and above a volume controller With the introduction of iOS 7 double clicking the home button also activates the application switcher However unlike previous versions it displays screenshots of open applications on top of the icon and horizontal scrolling allows for browsing through previous apps and it is possible to close applications by dragging them up similar to how WebOS handled multiple cards 129 With the introduction of iOS 9 the application switcher received a significant visual change while still retaining the card metaphor introduced in iOS 7 the application icon is smaller and appears above the screenshot which is now larger due to the removal of Recent and Favorite Contacts and each application card overlaps the other forming a rolodex effect as the user scrolls Now instead of the home screen appearing at the leftmost of the application switcher it appears rightmost 130 In iOS 11 the application switcher receives a major redesign In the iPad the Control Center and app switcher are combined The app switcher in the iPad can also be accessed by swiping up from the bottom In the iPhone the app switcher cannot be accessed if there are no apps in the RAM Ending tasks In iOS 4 0 to iOS 6 x briefly holding the icons in the application switcher makes them jiggle similarly to the homescreen and allows the user to force quit the applications by tapping the red minus circle that appears at the corner of the app s icon 131 Clearing applications from multitasking stayed the same from iOS 4 0 through 6 1 6 the last version of iOS 6 As of iOS 7 the process has become faster and easier In iOS 7 instead of holding the icons to close them they are closed by simply swiping them upwards off the screen Up to three apps can be cleared at a time compared to one in versions up to iOS 6 1 6 132 Task completion Task completion allows apps to continue a certain task after the app has been suspended 133 134 As of iOS 4 0 apps can request up to ten minutes to complete a task in the background 135 This doesn t extend to background uploads and downloads though e g if a user starts a download in one application it won t finish if they switch away from the application Siri Main article Siri Siri ˈ s ɪr i is an intelligent personal assistant integrated into iOS The assistant uses voice queries and a natural language user interface to answer questions make recommendations and perform actions by delegating requests to a set of Internet services The software adapts to users individual language usages searches and preferences with continuing use Returned results are individualized Originally released as an app for iOS in February 2010 136 it was acquired by Apple two months later 137 138 139 and then integrated into iPhone 4S at its release in October 2011 140 141 At that time the separate app was also removed from the iOS App Store 142 Siri supports a wide range of user commands including performing phone actions checking basic information scheduling events and reminders handling device settings searching the Internet navigating areas finding information on entertainment and is able to engage with iOS integrated apps 143 With the release of iOS 10 in 2016 Apple opened up limited third party access to Siri including third party messaging apps as well as payments ride sharing and Internet calling apps 144 145 With the release of iOS 11 Apple updated Siri s voices for more clear human voices it now supports follow up questions and language translation and additional third party actions 146 147 Game Center Main article Game Center Game Center is an online multiplayer social gaming network 148 released by Apple 149 It allows users to invite friends to play a game start a multiplayer game through matchmaking track their achievements and compare their high scores on a leaderboard iOS 5 and above adds support for profile photos 148 Game Center was announced during an iOS 4 preview event hosted by Apple on April 8 2010 A preview was released to registered Apple developers in August 148 It was released on September 8 2010 with iOS 4 1 on iPhone 4 iPhone 3GS and iPod Touch 2nd generation through 4th generation 150 Game Center made its public debut on the iPad with iOS 4 2 1 151 There is no support for the iPhone 3G original iPhone and the first generation iPod Touch the latter two devices did not have Game Center because they did not get iOS 4 152 However Game Center is unofficially available on the iPhone 3G via a hack 153 HardwareThe main hardware platform for iOS is the ARM architecture the ARMv7 ARMv8 A ARMv8 2 A ARMv8 3 A iOS releases before iOS 7 can only be run on iOS devices with 32 bit ARM processors ARMv6 and ARMv7 A architectures In 2013 iOS 7 was released with full 64 bit support which includes a native 64 bit kernel libraries drivers as well as all built in applications 154 after Apple announced that they were switching to 64 bit ARMv8 A processors with the introduction of the Apple A7 chip 155 64 bit support was also enforced for all apps in the App Store All new apps submitted to the App Store with a deadline of February 2015 and all app updates submitted to the App Store with a deadline of June 1 2015 156 iOS 11 drops support for all iOS devices with 32 bit ARM processors as well as 32 bit applications 157 158 making iOS 64 bit only 159 DevelopmentMain article iOS SDK The iOS SDK Software Development Kit allows for the development of mobile apps on iOS While originally developing iPhone prior to its unveiling in 2007 Apple s then CEO Steve Jobs did not intend to let third party developers build native apps for iOS instead directing them to make web applications for the Safari web browser 160 However backlash from developers prompted the company to reconsider 160 with Jobs announcing in October 2007 that Apple would have a software development kit available for developers by February 2008 161 162 The SDK was released on March 6 2008 163 164 The SDK is a free download for users of Mac personal computers 165 It is not available for Microsoft Windows PCs 165 The SDK contains sets giving developers access to various functions and services of iOS devices such as hardware and software attributes 166 It also contains an iPhone simulator to mimic the look and feel of the device on the computer while developing 166 New versions of the SDK accompany new versions of iOS 167 168 In order to test applications get technical support and distribute apps through App Store developers are required to subscribe to the Apple Developer Program 165 Combined with Xcode the iOS SDK helps developers write iOS apps using officially supported programming languages including Swift and Objective C 169 Other companies have also created tools that allow for the development of native iOS apps using their respective programming languages 170 171 Update history amp schedule Main article iOS version history iPhone platform usage as measured by the App Store on May 30th 2023 172 iOS 16 90 iOS 15 8 iOS 14 and earlier 2 iPad platform usage as measured by the App Store on May 30th 2023 172 iPadOS 16 71 iPadOS 15 20 iPadOS 14 and earlier 9 Apple provides major updates to the iOS operating system annually via iTunes and since iOS 5 also over the air 173 The device checks an XML based PLIST file on mesu apple com for updates Updates are delivered as unencrypted ZIP files Updates are checked for regularly and are downloaded and installed automatically if enabled Otherwise the user can install them manually or are prompted to allow automatic installation overnight if plugged in and connected to Wi Fi iPod Touch users originally had to pay for system software updates due to accounting rules that designated it not a subscription device like the iPhone or Apple TV 174 175 causing many iPod Touch owners not to update 176 In September 2009 a change in accounting rules won tentative approval affecting Apple s earnings and stock price and allowing iPod Touch updates to be delivered free of charge 177 178 Apple significantly extended the cycle of updates for iOS supported devices over the years The iPhone 1st generation and iPhone 3G only received two iOS updates while later models had support for five six and seven years 179 180 XNU kernel Main article XNU The iOS kernel is the XNU kernel of Darwin The original iPhone OS 1 0 up to iPhone OS 3 1 3 used Darwin 9 0 0d1 iOS 4 was based on Darwin 10 iOS 5 was based on Darwin 11 iOS 6 was based on Darwin 13 iOS 7 and iOS 8 are based on Darwin 14 iOS 9 is based on Darwin 15 iOS 10 is based on Darwin 16 iOS 11 is based on Darwin 17 iOS 12 is based on Darwin 18 iOS 13 is based on Darwin 19 iOS 14 is based on Darwin 20 iOS 15 is based on Darwin 21 iOS 16 is based on Darwin 22 181 In iOS 6 the kernel is subject to ASLR similar to that of OS X Mountain Lion This makes exploit possibilities more complex since it is not possible to know the location of kernel code Apple has made the XNU kernel open source 182 The source is under a 3 clause 183 BSD license for the original BSD parts with parts added by Apple under the Apple Public Source License 184 The versions contained in iOS are not available only the versions used in macOS are available iOS does not have kernel extensions kexts in the file system even if they are actually present The kernel cache can be decompressed to show the correct kernel along with the kexts all packed in the PRELINK TEXT section and their plists in the PRELINK INFO section The kernel cache can also be directly decompressed if decrypted using third party tools With the advent of iOS 10 betas and default plain text kernelcaches these tools can only be used after unpacking and applying lzssdec to unpack the kernel cache to its full size The kextstat provided by the Cydia alternative software does not work on iOS because the kextstat is based on kmod get info which is a deprecated API in iOS 4 and Mac OS X Snow Leopard There are other alternative software that can also dump raw XML data On developing devices the kernel is always stored as a statically linked cache stored in System Library Caches com apple kernelcaches kernelcache which is unpacked and executed at boot In the beginning iOS had a kernel version usually higher than the corresponding version of macOS Over time the kernels of iOS and macOS have gotten closer This is not surprising considering that iOS introduced new features such as the ASLR Kernel the default freezer and various security strengthening features that were first incorporated and subsequently arrived on macOS It appears Apple is gradually merging the iOS and macOS kernels over time The build date for each version varies slightly between processors This is due to the fact that the builds are sequential Kernel Image The kernel image base is randomized by the boot loader iBoot This is done by creating random data doing a SHA 1 hash of it and then using a byte from the SHA 1 hash for the kernel slide The slide is calculated with this formula base 0x01000000 slide byte 0x00200000 If the slide is 0 the static offset of 0x21000000 is used instead The adjusted base is passed to the kernel in the boot arguments structure at offset 0x04 which is equivalent to gBootArgs gt virtBase Kernel Map The kernel map is used for kernel allocations of all types kalloc kernel memory allocate etc and spans all of kernel space 0x80000000 0xFFFEFFFF The kernel based maps are submaps of the kernel map for example zone map ipc kernel map etc The strategy is to randomize the base of the kernel map A random 9 bit value is generated right after kmem init which establishes kernel map is multiplied by the page size The resulting value is used as the size for the initial kernel map allocation Future kernel map and submap allocations are pushed forward by a random amount The allocation is silently removed after the first garbage collection and reused This behaviour can be overridden with the kmapoff boot parameter Attacks The template below Overly detailed is being considered for merging See templates for discussion to help reach a consensus This section may contain an excessive amount of intricate detail that may interest only a particular audience Please help by spinning off or relocating any relevant information and removing excessive detail that may be against Wikipedia s inclusion policy December 2020 Learn how and when to remove this template message This section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed December 2020 Learn how and when to remove this template message Kext request allows applications to request information about kernel modules divided into active and passive operations Active operations load unload start stop etc require root access iOS removes the ability to load kernel extensions Passive operations were originally before iOS 6 unrestricted and allowed unprivileged users to query kernel module base addresses iOS6 inadvertently removed some limitations only the load address requests are disallowed So attackers can use kKextRequestPredicateGetLoaded to get load addresses and mach o header dumps The load address and mach o segment headers are obscured to hide the ASLR slide but mach o section headers are not This reveals the virtual addresses of loaded kernel sections This information leak has been closed with iOS 6 0 1 Versions codenames Main article List of Apple codenames iOS Internally iOS identifies each version by a codename often used internally only normally to maintain secrecy of the project For example the codename for iOS 14 is Azul Jailbreaking Main article iOS jailbreaking Since its initial release iOS has been subject to a variety of different hacks centered around adding functionality not allowed by Apple 185 Prior to the 2008 debut of Apple s native iOS App Store the primary motive for jailbreaking was to bypass Apple s purchase mechanism for installing the App Store s native applications 186 Apple claimed that it would not release iOS software updates designed specifically to break these tools other than applications that perform SIM unlocking however with each subsequent iOS update previously un patched jailbreak exploits are usually patched 187 When a device is booting it loads Apple s own kernel initially so a jailbroken device must be exploited and have the kernel patched each time it is booted up There are different types of jailbreak An untethered jailbreak uses exploits that are powerful enough to allow the user to turn their device off and back on at will with the device starting up completely and the kernel will be patched without the help of a computer in other words it will be jailbroken even after each reboot However some jailbreaks are tethered A tethered jailbreak is only able to temporarily jailbreak the device during a single boot If the user turns the device off and then boots it back up without the help of a jailbreak tool the device will no longer be running a patched kernel and it may get stuck in a partially started state such as Recovery Mode In order for the device to start completely and with a patched kernel it must be re jailbroken with a computer using the boot tethered feature of a tool each time it is turned on All changes to the files on the device such as installed package files or edited system files will persist between reboots including changes that can only function if the device is jailbroken such as installed package files In more recent years two other solutions have been created semi tethered and semi untethered A semi tethered solution is one where the device is able to start up on its own but it will no longer have a patched kernel and therefore will not be able to run modified code It will however still be usable for normal functions just like stock iOS To start with a patched kernel the user must start the device with the help of the jailbreak tool A semi untethered jailbreak gives the ability to start the device on its own On first boot the device will not be running a patched kernel However rather than having to run a tool from a computer to apply the kernel patches the user is able to re jailbreak their device with the help of an app usually sideloaded using Cydia Impactor running on their device In the case of the iOS 9 2 9 3 3 and 64 bit 10 x jailbreaks Safari based exploits were available thereby meaning websites could be used to rejailbreak In more detail Each iOS device has a bootchain that tries to make sure only trusted signed code is loaded A device with a tethered jailbreak is able to boot up with the help of a jailbreaking tool because the tool executes exploits via USB that bypass parts of that chain of trust bootstrapping to a pwned no signature check iBSS iBEC or iBoot to finish the boot process Since the arrival of Apple s native iOS App Store and along with it third party applications the general motives for jailbreaking have changed 188 People jailbreak for many different reasons including gaining filesystem access installing custom device themes and modifying SpringBoard An additional motivation is that it may enable the installation of pirated apps On some devices jailbreaking also makes it possible to install alternative operating systems such as Android and the Linux kernel Primarily users jailbreak their devices because of the limitations of iOS Depending on the method used the effects of jailbreaking may be permanent or temporary 189 In 2010 the Electronic Frontier Foundation EFF successfully convinced the U S Copyright Office to allow an exemption to the general prohibition on circumvention of copyright protection systems under the Digital Millennium Copyright Act DMCA The exemption allows jailbreaking of iPhones for the sole purpose of allowing legally obtained applications to be added to the iPhone 190 The exemption does not affect the contractual relations between Apple and an iPhone owner for example jailbreaking voiding the iPhone warranty however it is solely based on Apple s discretion on whether they will fix jailbroken devices in the event that they need to be repaired At the same time the Copyright Office exempted unlocking an iPhone from DMCA s anticircumvention prohibitions 191 Unlocking an iPhone allows the iPhone to be used with any wireless carrier using the same GSM or CDMA technology for which the particular phone model was designed to operate 192 Unlocking Main article SIM lock Initially most wireless carriers in the US did not allow iPhone owners to unlock it for use with other carriers However AT amp T allowed iPhone owners who had satisfied contract requirements to unlock their iPhone 193 Instructions to unlock the device are available from Apple 194 but it is ultimately at the sole discretion of the carrier to authorize unlocking the device 195 This allows the use of a carrier sourced iPhone on other networks Modern versions of iOS and the iPhone fully support LTE across multiple carriers wherever the phone was purchased 196 Programs to remove SIM lock restrictions are available but are not supported by Apple and most often not a permanent unlock a soft unlock 197 which modifies the iPhone so that the baseband will accept the SIM card of any GSM carrier SIM unlocking is not jailbreaking but a jailbreak is also required for these unofficial software unlocks The legality of software unlocking varies in each country for example in the US there is a DMCA exemption for unofficial software unlocking of devices purchased before January 26 2013 198 Digital rights managementThis section needs additional citations for verification Please help improve this article by adding citations to reliable sources in this section Unsourced material may be challenged and removed Find sources IOS news newspapers books scholar JSTOR November 2022 Learn how and when to remove this template message The closed and proprietary nature of iOS has garnered criticism particularly by digital rights advocates such as the Electronic Frontier Foundation computer engineer and activist Brewster Kahle Internet law specialist Jonathan Zittrain and the Free Software Foundation who protested the iPad s introductory event and have targeted the iPad with their Defective by Design campaign 199 200 201 202 Competitor Microsoft via a PR spokesman criticized Apple s control over its platform 203 At issue are restrictions imposed by the design of iOS namely digital rights management DRM intended to lock purchased media to Apple s platform the development model requiring a yearly subscription to distribute apps developed for the iOS the centralized approval process for apps as well as Apple s general control and lockdown of the platform itself Particularly at issue is the ability for Apple to remotely disable or delete apps at will Some in the tech community have expressed concern that the locked down iOS represents a growing trend in Apple s approach to computing particularly Apple s shift away from machines that hobbyists can tinker with and note the potential for such restrictions to stifle software innovation 204 205 Former Facebook developer Joe Hewitt protested against Apple s control over its hardware as a horrible precedent but praised iOS s sandboxing of apps 206 Security and privacySee also Mobile security WARRIOR PRIDE and Pegasus spyware iOS utilizes many security features in both hardware and software Below are summaries of the most prominent features Secure Boot Before fully booting into iOS there is low level code that runs from the Boot ROM Its task is to verify that the Low Level Bootloader is signed by the Apple Root CA public key before running it This process is to ensure that no malicious or otherwise unauthorized software can be run on an iOS device After the Low Level Bootloader finishes its tasks it runs the higher level bootloader known as iBoot If all goes well iBoot will then proceed to load the iOS kernel as well as the rest of the operating system 207 Secure Enclave The Secure Enclave is a coprocessor found in iOS devices part of the A7 and newer chips used for data protection It includes the user data pertaining to Touch ID Face ID and Apple Pay among other sensitive data 208 The purpose of the Secure Enclave is to handle keys and other info such as biometrics that is sensitive enough to not be handled by the Application Processor AP It is isolated with a hardware filter so the AP cannot access it 208 It shares RAM with the AP but its portion of the RAM known as TZ0 is encrypted The secure enclave itself is a flashable 4 MB AKF processor core called the secure enclave processor SEP as documented in Apple Patent Application 20130308838 Archived December 12 2020 at the Wayback Machine The technology used is similar to ARM s TrustZone SecurCore but contains proprietary code for Apple KF cores in general and SEP specifically It is also responsible for generating the UID key on A9 or newer chips that protects user data at rest citation needed It has its own secure boot process to ensure that it is completely secure A hardware random number generator is also included as a part of this coprocessor Each device s Secure Enclave has a unique ID that is given to it when it is made and cannot be changed This identifier is used to create a temporary key that encrypts the memory in this portion of the system The Secure Enclave also contains an anti replay counter to prevent brute force attacks 207 The SEP is located in the devicetree under IODeviceTree arm io sep and managed by the AppleSEPManager driver 209 In 2020 security flaws in the SEP were discovered causing concerns about Apple devices such as iPhones 210 Face ID Main article Face ID Face ID is a face scanner that is embedded in the notch on iPhone models X XS XS Max XR 11 11 Pro 11 Pro Max 12 12 Mini 12 Pro 12 Pro Max 13 13 Mini 13 Pro 13 Pro Max 14 and the 14 Plus On the iPhone 14 Pro and the 14 Pro Max it is embedded in the Dynamic Island 211 It can be used to unlock the device make purchases and log into applications among other functions When used Face ID only temporarily stores the face data in encrypted memory in the Secure Enclave as described above There is no way for the device s main processor or any other part of the system to access the raw data that is obtained from the Face ID sensor 207 Passcode iOS devices can have a passcode that is used to unlock the device make changes to system settings and encrypt the device s contents Until recently these were typically four numerical digits long However since unlocking the devices with a fingerprint by using Touch ID has become more widespread six digit passcodes are now the default on iOS with the option to switch back to four or use an alphanumeric passcode 207 Touch ID Main article Touch ID Touch ID is a fingerprint scanner that is embedded in the home button and can be used to unlock the device make purchases and log into applications among other functions When used Touch ID only temporarily stores the fingerprint data in encrypted memory in the Secure Enclave as described above Like Face ID there is no way for the device s main processor or any other part of the system to access the raw fingerprint data that is obtained from the Touch ID sensor 207 Address Space Layout Randomization Main article Address Space Layout Randomization Address Space Layout Randomization ASLR is a low level technique of preventing memory corruption attacks such as buffer overflows It involves placing data in randomly selected locations in memory in order to make it more difficult to predict ways to corrupt the system and create exploits ASLR makes app bugs more likely to crash the app than to silently overwrite memory regardless of whether the behavior is accidental or malicious 212 Non executable memory iOS utilizes the ARM architecture s Execute Never XN feature This allows some portions of the memory to be marked as non executable working alongside ASLR to prevent buffer overflow attacks including return to libc attacks 207 Encryption As mentioned above one use of encryption in iOS is in the memory of the Secure Enclave When a passcode is utilized on an iOS device the contents of the device are encrypted This is done by using a hardware AES 256 implementation that is very efficient because it is placed directly between the flash storage and RAM 207 iOS in combination with its specific hardware uses crypto shredding when erasing all content and settings by obliterating all the keys in effaceable storage This renders all user data on the device cryptographically inaccessible 213 Keychain See also iCloud iCloud Keychain The iOS keychain is a database of login information that can be shared across apps written by the same person or organization 207 This service is often used for storing passwords for web applications 214 App security Third party applications such as those distributed through the App Store must be code signed with an Apple issued certificate In principle this continues the chain of trust all the way from the Secure Boot process as mentioned above to the actions of the applications installed on the device by users Applications are also sandboxed meaning that they can only modify the data within their individual home directory unless explicitly given permission to do otherwise For example they cannot access data owned by other user installed applications on the device There is a very extensive set of privacy controls contained within iOS with options to control apps ability to access a wide variety of permissions such as the camera contacts background app refresh cellular data and access to other data and services Most of the code in iOS including third party applications runs as the mobile user which does not have root privileges This ensures that system files and other iOS system resources remain hidden and inaccessible to user installed applications 207 App Store bypasses Companies can apply to Apple for enterprise developer certificates These can be used to sign apps such that iOS will install them directly sometimes called sideloading without the app needing to be distributed via the App Store 215 The terms under which they are granted make clear that they are only to be used for companies who wish to distribute apps directly to their employees 215 Circa January February 2019 it emerged that a number of software developers were misusing enterprise developer certificates to distribute software directly to non employees thereby bypassing the App Store Facebook was found to be abusing an Apple enterprise developer certificate to distribute an application to underage users that would give Facebook access to all private data on their devices 216 217 218 Google was abusing an Apple enterprise developer certificate to distribute an app to adults to collect data from their devices including unencrypted data belonging to third parties 219 215 TutuApp Panda Helper AppValley and TweakBox have all been abusing enterprise developer certificates to distribute apps that offer pirated software 220 Network security iOS supports TLS with both low and high level APIs for developers By default the App Transport Security framework requires that servers use at least TLS 1 2 However developers are free to override this framework and utilize their own methods of communicating over networks When Wi Fi is enabled iOS uses a randomized MAC address so that devices cannot be tracked by anyone sniffing wireless traffic 207 Two factor authentication Main article Multi factor authentication Two factor authentication is an option in iOS to ensure that even if an unauthorized person knows an Apple ID and password combination they cannot gain access to the account It works by requiring not only the Apple ID and password but also a verification code that is sent to an iDevice or mobile phone number that is already known to be trusted 207 If an unauthorized user attempts to sign in using another user s Apple ID the owner of the Apple ID receives a notification that allows them to deny access to the unrecognized device 221 Hardened memory allocation iOS features a hardened memory allocator known as kalloc type that was introduced in iOS 15 Since the XNU kernel is primarily written in memory unsafe languages such as C and C 222 kalloc type is designed to mitigate the large amount of vulnerabilities that result from the use of these languages in the kernel In order to achieve this kalloc type implements mitigations such as type isolation in order to prevent type confusion and buffer overflow vulnerabilities Ultimately the prevention of privilege escalation is intended 223 ReceptionMarket share See also Usage share of operating systems This section needs to be updated Please help update this article to reflect recent events or newly available information May 2022 Worldwide market share of smartphone operating systemsAndroid 68 61 iOS 30 61 Other 0 78 Source Statcounter April 2023 update 224 iOS is the second most popular mobile operating system in the world after Android Sales of iPads in recent years are also behind Android while by web use a proxy for all use iPads using iOS are still the most popular 225 By the middle of 2012 there were 410 million devices activated 226 At WWDC 2014 Tim Cook said 800 million devices had been sold by June 2014 227 During Apple s quarterly earnings call in January 2015 the company announced that they had sold over one billion iOS devices since 2007 228 229 By late 2011 iOS accounted 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amp oldid 1179563042, wikipedia, wiki, book, books, library,

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