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The four area codes form an overlay numbering plan for the same geographic region, where area code 905 was established in October 1993 in an area code split from area code 416. When 289 was overlaid on June 9, 2001, all local calls required ten-digit dialing .
Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers .
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Toronto is the centre of the largest local calling area in Canada, and one of the largest in North America. As of 2013, the following points in area code 905 were a local call to 416 in Toronto: Ajax-Pickering, Aurora, Beeton, Bethesda, Bolton, Brampton, Caledon East, Campbellville, Castlemore, Claremont, Georgetown, Gormley, King City, Markham, Milton, Mississauga (rate centres Clarkson ...
The first example of an area code overlaid on an entire U.S. jurisdiction was Puerto Rico, with area code 939 added to the numbering plan area of area code 787, in 2001. Puerto Rico had just been split from area code 809, the area code for much of the Caribbean, in 1996. A split was deemed unfeasible due to the island's extremely dense ...
Area code 904 was created in an area code split of area code 305 in 1965. In 2024, the numbering plan received a second area code, 324 , through the creation of an overlay complex to mitigate central office code exhaustion and provide additional telephone numbers in the area.
At this point, 903 was withdrawn from use and replaced with area code 706, [1] as one of two area codes for alternative dialing into certain parts of Mexico from the United States. The other area code used for this was 905. 706 and 905 were dial-around codes that replaced +52(5) for Mexico City and +52(6) for northwestern Mexico. In February ...