Telephone numbers in the United Kingdom

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In the United Kingdom, telephone numbers are administered by the Office of Communications (Ofcom). For this purpose, Ofcom established a telephone numbering plan, known as the National Telephone Numbering Plan, which is the system for assigning telephone numbers to subscriber stations.

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Telephone numbers in United Kingdom
Telephone Dialling Codes in the United Kingdom
CountryUnited Kingdom
NSN length7, 9, 10[notes 1]
Formatvarious, see text
Numbering planThe National Telephone Numbering Plan
Last updated18 September 2010
Access codes
Country code44
International call prefix00
Trunk prefix0
List of United Kingdom dialing codes

Telephone numbers are of variable length. Local numbers are supported from landlines. Numbers can be dialled with a '0'-lead prefix that denotes either a geographical region or another service. Mobile phone numbers have distinct prefixes that are not geographic, and are portable between providers.