Area codes 306, 639, and 474

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

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


See also

References
  1. "Telecom Decision CRTC 2010-784". Ottawa: Canadian Radio-television and Telecommunications Commission. 2010-10-22. Retrieved 2021-11-07.
  2. "New Sask. area code coming". 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. "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.
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

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