Telephone numbers in the United Kingdom

Telephone numbers in the United Kingdom 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.

United Kingdom telephone numbers
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 calling code+44
International call prefix00
Trunk prefix0
List of United Kingdom dialing codes

The numbers are of variable length. Local numbers are supported from land-lines or numbers can be dialled with a '0'-lead prefix that denotes either a geographical region or another service. Mobile phone numbers have their own prefixes which are not geographical and are completely portable between providers.

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