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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.
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.
This is one of Psiĥedelisto's US telephone area code maps. They all have different color schemes because they are made to supersede a patchwork of existing maps on English Wikipedia. Around one per every two days were made between December 2, 2016 and (no end date yet!
Overlayed new area code 640 over 609: 06:38, 16 January 2017: 408 × 391 (3.65 MB) Psiĥedelisto: fix wrong color of area code 609 barrier islands which was masked by outlines in previous version of image: 21:45, 3 December 2016: 408 × 391 (3.65 MB) Kbrose: Remove black emphasis of border lines: 16:37, 2 December 2016: 408 × 391 (3.67 MB ...
The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. [ 1 ] In 1950, the boundaries of the numbering plan area were redrawn to produce a division of the northern and central parts along a north–south ...
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