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This list is based on the official standard, but includes defunct codes and historical changes, including the derivation of the two letter identities, in cases where known. [ 1 ] [ 2 ] [ 3 ] Dialling codes do not correspond to specific political boundaries: for example, the Coventry dialling code covers a large area of Warwickshire and the ...
STD codes are two, three, four or, exceptionally, five digits long (after the initial zero). Regions with shorter area codes, typically large cities, permit the allocation of more telephone numbers as the local number part has more digits. Local customer numbers are four to eight digits long. The total number of digits is ten or, very rarely, nine.
PhONEday had cleared area codes from 02 to 09 of all geographic allocations by converting 9-digit numbers to 10-digit 01 numbers (and, in parts of at least 47 area codes, 8-digit numbers to 9-digit 01 numbers). After PhONEday, all pre-existing 9-digit mobile, non-geographic, premium rate, personal and pager numbers from 02 to 09 remained in place.
The original concept was for there to be a nationwide Director system, and in common with the Director system, Group Switching Centres were originally based in major towns and assigned codes based on two letters of the respective place's name and the corresponding numbers on a telephone dial.
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Some widespread misunderstandings about area codes came about with the Big Number Change, most notably with London area codes. There is a widespread but erroneous assumption that London has several area codes – 0203, 0204, 0207 and 0208 – whereas, in fact, it has just one: 020. Similar misunderstandings came about with a few other area codes.
Linked country codes are from ISO 3166-1. Series allocated to an international organization. Provisional allocation in accordance with No. S19.33: "Between radiocommunication conferences, the Secretary-General is authorized to deal with questions relating to changes in the allocation of series of call signs, on a provisional basis, and subject ...
As CLASS was an AT&T trademark, the term vertical service code was adopted by the North American Numbering Plan Administration. The use of vertical is a somewhat dated reference to older switching methods and the fact that these services can only be accessed by a telephone subscriber, going up ( vertically ) inside the local central office ...