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Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as country dial-in codes, or historically international subscriber dialing (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
0 was traditionally the number dialled for the operator for long-distance calls before subscriber trunk dialling (STD) was introduced, and so was retained as a prefix for direct-dialled calls. In the majority of areas, the area code still corresponds to the original STD letter code. When dialling from abroad, the 0 prefix is not dialled. When ...
Subscriber trunk dialling (STD), also known as subscriber toll dialing, is a telephone numbering plan feature and telecommunications technology in the United Kingdom and various Commonwealth countries for the dialling of trunk calls by telephone subscribers without the assistance of switchboard operators.
In the United Kingdom, the "area code" is often referred to as a "subscriber trunk dialling code" (STD code) or a "dialling code". 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 ...
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.
Area codes 408 and 669 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. state of California. The numbering plan area comprises most of Santa Clara County and Northern Santa Cruz County , and includes Gilroy , Morgan Hill , Saratoga , Los Gatos , Monte Sereno , Milpitas , Sunnyvale , Santa Clara , Cupertino ...
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Telephone dialling codes in Ireland. Country code: +353 International call prefix: 00 Trunk prefix: 0. This is a list of telephone dialling codes for the Republic of Ireland. Fixed-line telephone users do not need to dial the dialling code when they are contacting someone else within their own area.