On Tuesday 20 July 2010, the CRTC announced that Toronto ON will likely need an additional area code to its already existing 416/647 overlay, by or during 2015.the CRTC press release
and(HTML) (Adobe-Acrobat) for the Telecom Notice of Consultation CRTC 2010-490
It doesn't actually specify that the new area code "must" be an additional overlay, but that the telco industry in Ontario (through the Canadian Numbering Administration) is to come up with one (or more) area code relief options submitted to the CRTC.
However, considering that the last area code split in Canada was the Alberta 403/780 split of early 1999, that every new area code introduced in Canada in 2001, 2006, 2008, 2010, and planned so far for 2011-forward is going to be an overlay, especially since 416/647 is already in an overlay, and that adjacent 905/289 for the Toronto ON suburbs/"outer ring" is to be overlaid with 365 in March 2013, it is very likely that the existing 416/647 area code region for Toronto ON "itself" is going to be further overlaid, NOT split. The "likely" new area code could be437, but this is not yet a "given".
A few days ago, SAIC-CNA (Canadian Numbering Administrator) set up the beginnings of a page at its website for documents and announcements regarding additional relief (early 20-teens) for the 416/647 region,Right now, it is only a "skeleton" page, with no additional documents nor announcements (other than some June 2010 "NRUF-related" documents regarding 416/647), it does not yet even have the CRTC's announcements of Tuesday 20-July-2010. But those CRTC documents and other documents going forward regarding 416/647/ (future 437 ??), will be posted here.
The existing 905/289/forthcoming-365 area code region for the Toronto ON suburbs (outer ring) split from the 416/647 Toronto ON "City" area code as the 416/905 area code split, back in 1993/94. This was the first completely "brand new" geographic/POTS area code introduced in Canada since 1962 when there was the 705/807 split in western Ontario, and when709 was introduced for Newfoundland/Labrador splitting from having to share from New Brunswick's 506 (although the use of 506 to identify or "reach" any exchanges in Newfoundland/Labrador (NL) would have only been used by Operators prior to 1962 since customer DDD "to" NL didn't start until 1962 when 709 was "split" from sharing from NB's 506).
There were further splits in Canada in the later 1990s, but starting in2001, every new area code in Canada was an overlay. In 2001, Toronto's 416 was overlaid with 647, and the Toronto Metro suburbs and "outer ring" 905 was overlaid with 289. Other southern/southeastern Ontario area codes which border 905/etc, or are at least close by to 416/etc, have since been overlaid: 519 overlaid with 226 in 2006, 613 overlaid with 343 this year 2010, and 705 to be overlaid with 249 next year 2011. And then the 905/289 Toronto ON Metro's "outer ring" is to be overlaid with 365 in March 2013.
And now it is announced by the CRTC that the 416/647 area code overlay pair for Toronto ON "itself", will need further area code relief by 2015, and although not specified as a "given" by the CRTC, it is very likely that this will be a further overlay, and it is also quite likely that437 could be the additional new area code.
More details to come as they are known.
Mark J. Cuccia markjcuccia at yahoo dot com Lafayette LA, formerly of New Orleans LA pre-Katrina