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Area code 403 is a telephone area code in the North American Numbering Plan (NANP) for the Canadian province of Alberta. The numbering plan area encompasses the southern third of the province, which includes the Calgary area. This numbering plan area is also served by area codes 587, 825, and 368, which form a complex overlay for all of Alberta.
prior to 1991, was the area code for Mexico City; split of 416; 2001: overlaid by 289; 2013: overlaid by 365; 2021: overlaid by 742 [8] 537 reserved as a fifth area code for the region. 906: Michigan (Upper Peninsula: Sault Ste. Marie, Escanaba, Houghton, Iron Mountain, Marquette, Menominee, etc.) March 19, 1961: split of 616; 907
This became mandatory on September 12. On September 20, Telus Mobility began allocating telephone numbers starting in area code 587 in the Calgary area. [5] An overlay was chosen rather than a splitting 403 or 780, which would have resulted in subscribers in portions of Alberta to change their telephone numbers for the second time in a decade.
In 2011, area code 603 was said to be nearing exhaustion and a second area code for New Hampshire was expected to be activated by 2013 as a statewide overlay plan. [1] As a result of changes in allocation policies and a reclamation of a large block of previously allocated telephone numbers, including number pooling , the exhaustion time frame ...
When the original North American area codes were introduced for a nationwide telephone numbering plan in 1947, the entire state was a single numbering plan area (NPA) with area code 305. In 1953, area code 813 was introduced for the western coast of Florida, and 904 was assigned for northern Florida in 1965. In 1988, area code 407 was ...
Area code 303 is the original area code of the NPA, as well as for the entire state, reduced in geographic extent over time. Area codes 720 and 983 were added in 1998 and 2022, respectively, to form an overlay complex for the area, meaning that the same geographic service area is served by all area codes and that ten-digit dialing is required ...
The original numbering plan area (NPA) was split twice: in 1957 to create area code 819 and in 1998 to create area code 450. In 2006, the entire remaining 514 area was assigned a second area code, 438, in an overlay plan that made ten-digit dialing mandatory in the Montreal area. Area code 263 was added to the overlay in October 2022.
Area code 404 is a telephone area code in the North American Numbering Plan (NANP) for Atlanta, Georgia and its closest suburbs. This comprises roughly the area encircled by Interstate 285 . It is an enclave area code, surrounded by area code 770 , which serves most of Atlanta's suburbs.