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Area codes 306, 639, and 474

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Area codes 306, 639, and 474are telephonearea codesin theNorth American Numbering Plan(NANP) for the entireCanadian provinceofSaskatchewan.Area code 306 is one of theoriginal North American area codesassigned in 1947. Area codes 639 and 474 were added to the numbering plan area in creation of anoverlay complexfor the entire province in 2013 and 2021, respectively. The incumbent local exchange carrier isSaskTel.

History

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When theAmerican Telephone and Telegraph Company(AT&T) created the first nationwidetelephone numbering planin the second half of the 1940s, the United States and Canada were divided into 86numbering planareas. 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 inReginaandSaskatoon.

In long-term nationwide planning in October 2010, theCanadian 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 theCanadian 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 considered various options, including a north–south split of the 306 area code. Under this plan, half of the province would keep the 306 area code, while the other half would transition 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 totetraphobiain 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 dialingwas phased in for area code 306 starting on February 25, 2013. On that date, apermissive dialingperiod 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

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See also

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References

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  1. ^"Telecom Decision CRTC 2010-784".Ottawa:Canadian Radio-television and Telecommunications Commission.2010-10-22.Retrieved2021-11-07.
  2. ^"New Sask. area code coming".cbc.ca. 2011-01-06.Archivedfrom the original on 2011-01-10.Retrieved2011-01-11.
  3. ^"Telecom Notice of Consultation CRTC 2011-260".Ottawa:Canadian Radio-television and Telecommunications Commission.2011-04-19.Retrieved2021-11-07.
  4. ^NPA 306 Relief Planning Committee (Ad Hoc) (2011-05-18)."NPA 306 Initial Planning Document - Text Only"(DOC).Canadian Numbering Administrator.Retrieved2021-11-07.{{cite web}}:CS1 maint: numeric names: authors list (link)
  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.Retrieved2021-11-07.{{cite web}}:CS1 maint: numeric names: authors list (link)
  7. ^"639 to be Sask.'s 2nd area code".CBC. 2011-06-14.Retrieved2011-10-11.
  8. ^Canadian Numbering Administrator (2011-11-18)."Planning Letter 431: NPA 639 to Overlay NPA 306 (Saskatchewan, Canada)"(PDF).NANPA.Retrieved2023-09-18.
  9. ^ab"Planning Letter 446: NPA 639 to Overlay NPA 306 (Saskatchewan, Canada)"(PDF).NANPA. 2013-01-22.Retrieved2023-09-18.
  10. ^"Telecom Decision CRTC 2011-533".Ottawa:Canadian Radio-television and Telecommunications Commission.2011-08-26.Retrieved2021-11-07.
  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.Retrieved2023-09-18.
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Saskatchewanarea codes:306/639/474
North:867
West:403,780,368/587/825 (overlay) 306/639 East:204/431
South:701,406
Yukon,Northwest TerritoriesandNunavutarea codes:867
Manitobaarea codes:204/431/584
Albertaarea codes:403,587/825/368,780
North Dakotaarea codes:701
Montanaarea codes:406

54°30′30″N105°40′00″W/ 54.50833°N 105.66667°W/54.50833; -105.66667(Area code 306)

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