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A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing.
A telephone numbering plan is a system used in telecommunications to give telephone numbers to customers and to route telephone calls in a telephone network. A closed numbering plan imposes a fixed length to numbers, such as in North America (10-digit). An open numbering plan may have telephone numbers that vary in length.
Telephone numbers in United Kingdom Telephone Dialling Codes in the United Kingdom Location Country United Kingdom Continent Europe Regulator Ofcom Type Open NSN length 7, 9, 10 [notes 1] Format various, see text Numbering plan The National Telephone Numbering Plan Last updated 18 September 2010 Access codes Country code 44 International access 00 Long-distance 0 List of United Kingdom dialing ...
In Europe, the development of open numbering plans was more prevalent, in which a telephone number comprised a varying count of digits. Irrespective of the type of numbering plan, "shorthand" or "speed calling" numbers are automatically translated to unique telephone numbers before the call can be connected.
All-number calling (ANC) is a telephone numbering plan that was introduced into the North American Numbering Plan by the Bell System in the United States starting in 1958 to replace the previous system of using a telephone exchange name as the first part of a telephone number.
