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Area codes 306, 639, and 474

October 21, 2023

Area codes 306, 639, and 474 are telephone area codes in the North American Numbering Plan (NANP) for the entire Canadian province of Saskatchewan. Area code 306 is one of the original North American area codes assigned in 1947. Area codes 639 and 474 were added to the numbering plan area in creation of an overlay complex for the entire province in 2013 and 2021, respectively. The incumbent local exchange carrier is SaskTel.

History Edit

When the American Telephone and Telegraph Company (AT&T) created the first nationwide telephone numbering plan in the second half of the 1940s, United States and Canada were divided into 86 numbering plan area]]s. Saskatchewan received area code 306 in 1947.

By the mid-2000s, area code 306 came under the threat of central office code exhaustion because of demand for telecommunication services from the proliferation of cell phones and other mobile devices requiring unique telephone numbers, particularly in Regina and Saskatoon.

In long-term nationwide planning in October 2010, the Canadian Radio-television and Telecommunications Commission (CRTC) tentatively reserved a group of new area codes for future relief of existing numbering plan areas that were expected to exhaust in the next 25 years; area code 474 was set aside for relief of area code 306 in Saskatchewan.[1]

In early 2011, a routine analysis by the Canadian Numbering Administrator (CNA) revealed that area code 306 had experienced an unforecasted surge in telephone number allocation and was at risk of exhaustion within three years (a situation referred to as a "jeopardy condition").[2] In response, the CRTC immediately initiated relief planning measures.[3]

The planning committee evaluated multiple options involving a north–south split of 306, with half the province retaining 306 while the other half transferred to a new area code. Ultimately, the committee determined that an overlay area code was overwhelmingly better. Given the CRTC's decision the year before, the committee's initial planning document (dated May 18, 2011) recommended the assignment of area code 474 for this purpose, mirroring an assumption that had already been reported in the press.[4][5]

By the time the committee's planning document was finalized on July 13, 2011, the recommended new area code had changed to 639, an option that was regarded as equally technically viable.[6] The document did not address this divergence from the CRTC's prior allocation nor give a reason for the change, but news reports suggest that it was SaskTel who made the decision to eschew 474, citing a sensitivity to tetraphobia in the community, and that the choice of 639 as a replacement was based on its mathematical similarities with the existing area code.[7]

The proposal to implement 639 as an overlay had the effect of allocating 15.8 million numbers to a province of just over a million people. However, SaskTel and other carriers wanted to spare existing subscribers, particularly in rural areas, the expense and burden of changing their numbers. Overlays have become the preferred method of area code relief in Canada; no area codes have been split in the country since 1999.

On August 26, 2011, the CRTC accepted the relief planning committee's recommendation.[8][9] Ten-digit dialing was phased in for area code 306 starting on February 25, 2013. On that date, a permissive dialing period began during which seven- and ten-digit calls could complete. Ten-digit dialing became mandatory in Saskatchewan on May 11, 2013, two weeks before the in-service date of May 25. Beginning on September 26, 2013, standard error intercept announcements resumed.[9][10] Until the implementation of the overlay, Saskatchewan was the last of Canada's original NPAs where seven-digit dialing was still possible.

In July 2018, area code 474 was reserved as a future area code for all of Saskatchewan, as area codes 306 and 639 are expected to exhaust their central office prefixes as early as June 2022.[11] The in-service date of area code 474 was October 2, 2021, with no changes in the established dialing procedure.[12]

Service area and central office prefixes Edit


See also Edit

References Edit

  1. ^ "Telecom Decision CRTC 2010-784". Ottawa: Canadian Radio-television and Telecommunications Commission. 2010-10-22. Retrieved 2021-11-07.
  2. ^ . cbc.ca. 2011-01-06. Archived from the original on 2011-01-10. Retrieved 2011-01-11.
  3. ^ "Telecom Notice of Consultation CRTC 2011-260". Ottawa: Canadian Radio-television and Telecommunications Commission. 2011-04-19. Retrieved 2021-11-07.
  4. ^ NPA 306 Relief Planning Committee (Ad Hoc) (2011-05-18). "NPA 306 Initial Planning Document - Text Only" (DOC). Canadian Numbering Administrator. Retrieved 2021-11-07.
  5. ^ "New area code, 474, coming to Saskatchewan". CBC News. 2011-03-31.
  6. ^ NPA 306 Relief Planning Committee (Ad Hoc) (2011-07-13). "TIF Report #2 - NPA 306 Planning Document & Relief Implementation Plan" (PDF). Canadian Numbering Administrator. Retrieved 2021-11-07.
  7. ^ "639 to be Sask.'s 2nd area code". CBC. 2011-06-14. Retrieved 2011-10-11.
  8. ^ Canadian Numbering Administrator (2011-11-18). "Planning Letter 431: NPA 639 to Overlay NPA 306 (Saskatchewan, Canada)" (PDF). NANPA. Retrieved 2023-09-18.
  9. ^ a b "Planning Letter 446: NPA 639 to Overlay NPA 306 (Saskatchewan, Canada)" (PDF). NANPA. 2013-01-22. Retrieved 2023-09-18.
  10. ^ "Telecom Decision CRTC 2011-533". Ottawa: Canadian Radio-television and Telecommunications Commission. 2011-08-26. Retrieved 2021-11-07.
  11. ^ "New, 3rd area code picked for Saskatchewan". CBC News. 21 Jul 2018.
  12. ^ "Planning Letter 530: NPA 474 to Overlay NPA 306/639 (Saskatchewan, Canada)" (PDF). NANPA. 2019-08-20. Retrieved 2023-09-18.

External links Edit

  • Area Code Map of Canada
Saskatchewan area codes: 306, 639
North: 867
West: 403, 780, 368/587/825 (overlay) 306/639 East: 204/431
South: 701, 406
Yukon, Northwest Territories and Nunavut area codes: 867
Manitoba area codes: 204, 431
Alberta area codes: 403, 587/825/368, 780
North Dakota area codes: 701
Montana area codes: 406

54°30′30″N 105°40′00″W / 54.50833°N 105.66667°W / 54.50833; -105.66667 (Area code 306)

October 21, 2023
area, codes, telephone, area, codes, north, american, numbering, plan, nanp, entire, canadian, province, saskatchewan, area, code, original, north, american, area, codes, assigned, 1947, area, codes, were, added, numbering, plan, area, creation, overlay, compl. Area codes 306 639 and 474 are telephone area codes in the North American Numbering Plan NANP for the entire Canadian province of Saskatchewan Area code 306 is one of the original North American area codes assigned in 1947 Area codes 639 and 474 were added to the numbering plan area in creation of an overlay complex for the entire province in 2013 and 2021 respectively The incumbent local exchange carrier is SaskTel Contents 1 History 2 Service area and central office prefixes 3 See also 4 References 5 External linksHistory EditWhen the American Telephone and Telegraph Company AT amp T created the first nationwide telephone numbering plan in the second half of the 1940s United States and Canada were divided into 86 numbering plan area s Saskatchewan received area code 306 in 1947 By the mid 2000s area code 306 came under the threat of central office code exhaustion because of demand for telecommunication services from the proliferation of cell phones and other mobile devices requiring unique telephone numbers particularly in Regina and Saskatoon In long term nationwide planning in October 2010 the Canadian Radio television and Telecommunications Commission CRTC tentatively reserved a group of new area codes for future relief of existing numbering plan areas that were expected to exhaust in the next 25 years area code 474 was set aside for relief of area code 306 in Saskatchewan 1 In early 2011 a routine analysis by the Canadian Numbering Administrator CNA revealed that area code 306 had experienced an unforecasted surge in telephone number allocation and was at risk of exhaustion within three years a situation referred to as a jeopardy condition 2 In response the CRTC immediately initiated relief planning measures 3 The planning committee evaluated multiple options involving a north south split of 306 with half the province retaining 306 while the other half transferred to a new area code Ultimately the committee determined that an overlay area code was overwhelmingly better Given the CRTC s decision the year before the committee s initial planning document dated May 18 2011 recommended the assignment of area code 474 for this purpose mirroring an assumption that had already been reported in the press 4 5 By the time the committee s planning document was finalized on July 13 2011 the recommended new area code had changed to 639 an option that was regarded as equally technically viable 6 The document did not address this divergence from the CRTC s prior allocation nor give a reason for the change but news reports suggest that it was SaskTel who made the decision to eschew 474 citing a sensitivity to tetraphobia in the community and that the choice of 639 as a replacement was based on its mathematical similarities with the existing area code 7 The proposal to implement 639 as an overlay had the effect of allocating 15 8 million numbers to a province of just over a million people However SaskTel and other carriers wanted to spare existing subscribers particularly in rural areas the expense and burden of changing their numbers Overlays have become the preferred method of area code relief in Canada no area codes have been split in the country since 1999 On August 26 2011 the CRTC accepted the relief planning committee s recommendation 8 9 Ten digit dialing was phased in for area code 306 starting on February 25 2013 On that date a permissive dialing period began during which seven and ten digit calls could complete Ten digit dialing became mandatory in Saskatchewan on May 11 2013 two weeks before the in service date of May 25 Beginning on September 26 2013 standard error intercept announcements resumed 9 10 Until the implementation of the overlay Saskatchewan was the last of Canada s original NPAs where seven digit dialing was still possible In July 2018 area code 474 was reserved as a future area code for all of Saskatchewan as area codes 306 and 639 are expected to exhaust their central office prefixes as early as June 2022 11 The in service date of area code 474 was October 2 2021 with no changes in the established dialing procedure 12 Service area and central office prefixes EditArborfield 306 768 Balgonie 306 702 771 Beauval 306 288 Borden 306 997 Bredenbury 306 620 898 Buchanan 306 592 Calder 306 742 Canora 306 563 Carrot River 306 401 768 Central Butte 306 796 Churchbridge 306 896 Colonsay 306 255 Craik 306 734 639 208 Dalmeny 306 254 Dubuc 306 877 Esterhazy 306 701 745 Estevan 306 308 339 340 415 421 461 471 634 636 637 687 639 450 534 Eston 306 402 Eyebrow 306 759 Foam Lake 306 272 Fort Qu Appelle 306 331 332 804 900 Francis 306 245 Goodeve 306 876 Grayson amp Crooked Lake 306 794 Hague 306 225 Hanley 306 544 Hudson Bay 306 470 865 600 Humboldt 306 231 289 320 366 367 368 598 682 944 639 535 Invermay 306 493 Kamsack 306 542 591 Kelvington 306 327 Kindersley 306 379 430 460 463 512 604 806 838 965 967 968 639 539 Kenaston 306 252 Langenburg 306 496 740 743 Lemberg 306 335 Lloydminster 306 214 307 603 808 820 821 825 830 875 639 536 840 Lumsden 306 731 639 392 Luseland 306 372 Marquis 306 788 Meadow Lake 306 234 236 240 304 819 639 537 Meath Park 306 929 Melfort 306 275 277 346 752 863 920 921 Melville 306 607 705 707 720 728 730 748 760 Milestone 306 436 639 440 450 Mistatim 306 889 Moose Jaw 306 214 313 556 624 630 631 681 684 690 691 692 693 694 704 756 905 972 983 990 639 538 Neudorf 306 748 Nipawin 306 862 Norquay 306 594 North Battleford 306 208 317 386 407 440 441 445 446 470 480 481 490 499 817 906 937 Pelly 306 595 Pilot Butte 306 584 586 781 Porcupine Plain 306 278 Preeceville 306 547 Prince Albert 306 314 557 703 763 764 765 904 922 930 940 941 953 960 961 970 980 981 987 639 314 533 760 Prud homme 306 654 639 653 Radisson 306 827 639 913 Regina 306 201 205 206 209 216 337 347 351 352 359 450 501 502 503 509 510 517 519 520 522 523 525 526 527 529 530 531 533 535 536 537 539 540 541 543 545 546 550 551 552 559 564 565 566 569 570 580 581 584 585 586 591 596 719 721 737 751 757 761 766 775 777 779 780 781 787 789 790 791 797 798 807 908 910 924 926 936 949 988 992 993 994 995 999 639 221 316 444 528 560 571 590 600 601 602 603 604 605 606 607 608 609 625 640 641 642 643 644 645 646 647 648 649 739 740 888 915 955 997 999 Rhein 306 273 Rocanville 306 645 Rose Valley 306 322 Rouleau 306 776 639 394 Saltcoats 306 744 Saskatoon 306 200 202 203 220 221 222 227 229 230 241 242 244 249 250 251 260 261 262 270 280 281 290 291 292 321 341 343 361 370 371 373 374 380 381 382 384 385 477 491 500 514 518 612 649 651 652 653 655 657 659 664 665 667 668 683 700 713 715 716 717 803 844 850 866 875 880 881 899 902 912 914 931 933 934 938 952 955 956 964 966 974 975 977 978 979 985 986 996 998 639 220 317 470 471 480 630 635 887 916 994 996 998 Sheho 306 849 St Isidore de Bellevue 306 423 Stockholm 306 793 Strasbourg 306 725 639 914 Sturgis 306 548 Swift Current 306 315 437 712 741 750 770 772 773 774 778 816 907 971 973 639 541 Theodore 306 647 Tisdale 306 873 Unity 306 228 Uranium City 306 498 Wadena 306 338 Watrous 306 917 946 639 395 Weyburn 306 405 504 509 809 842 848 861 869 870 891 897 908 Wynyard 306 554 Yorkton 306 316 521 620 621 641 708 782 783 786 818 828 890 909 639 540 Premium services 306 474 639 976 See also Edit nbsp Canada portalTelephone numbers in Canada Canadian Numbering Administration Consortium List of North American Numbering Plan area codesReferences Edit Telecom Decision CRTC 2010 784 Ottawa Canadian Radio television and Telecommunications Commission 2010 10 22 Retrieved 2021 11 07 New Sask area code coming cbc ca 2011 01 06 Archived from the original on 2011 01 10 Retrieved 2011 01 11 Telecom Notice of Consultation CRTC 2011 260 Ottawa Canadian Radio television and Telecommunications Commission 2011 04 19 Retrieved 2021 11 07 NPA 306 Relief Planning Committee Ad Hoc 2011 05 18 NPA 306 Initial Planning Document Text Only DOC Canadian Numbering Administrator Retrieved 2021 11 07 New area code 474 coming to Saskatchewan CBC News 2011 03 31 NPA 306 Relief Planning Committee Ad Hoc 2011 07 13 TIF Report 2 NPA 306 Planning Document amp Relief Implementation Plan PDF Canadian Numbering Administrator Retrieved 2021 11 07 639 to be Sask s 2nd area code CBC 2011 06 14 Retrieved 2011 10 11 Canadian Numbering Administrator 2011 11 18 Planning Letter 431 NPA 639 to Overlay NPA 306 Saskatchewan Canada PDF NANPA Retrieved 2023 09 18 a b Planning Letter 446 NPA 639 to Overlay NPA 306 Saskatchewan Canada PDF NANPA 2013 01 22 Retrieved 2023 09 18 Telecom Decision CRTC 2011 533 Ottawa Canadian Radio television and Telecommunications Commission 2011 08 26 Retrieved 2021 11 07 New 3rd area code picked for Saskatchewan CBC News 21 Jul 2018 Planning Letter 530 NPA 474 to Overlay NPA 306 639 Saskatchewan Canada PDF NANPA 2019 08 20 Retrieved 2023 09 18 External links EditCNA exchange list for area code 306 CNA exchange list for area code 639 Telecom archives Area Code Map of CanadaSaskatchewan area codes 306 639 North 867West 403 780 368 587 825 overlay 306 639 East 204 431South 701 406Yukon Northwest Territories and Nunavut area codes 867Manitoba area codes 204 431Alberta area codes 403 587 825 368 780North Dakota area codes 701Montana area codes 406 54 30 30 N 105 40 00 W 54 50833 N 105 66667 W 54 50833 105 66667 Area code 306 Retrieved from https en wikipedia org w index php title Area codes 306 639 and 474 amp oldid 1176006565, wikipedia, wiki, book, books, library,

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