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This is a list of telephone dialling codes in the United Kingdom and the Crown Dependencies, which adopts an open telephone numbering plan for its public switched telephone network. The national telephone numbering plan is maintained by Ofcom , an independent regulator and competition authority for the UK communications industries.
UK National Telephone Numbering Plan (PDF) Ofcom – Telephone Area Code Tool – UK dialling code lookup; Regular Expressions for Validating and Formatting GB Telephone Numbers Archived 6 April 2014 at the Wayback Machine; The first 25 years of STD code changes summarised (PDF) UK Area Codes lookup
Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
The UK Public Switched Telephone Network is divided up by area into National Number Groups (NNG's), and then further divided up into dialling codes.. The structure of UK telephone numbers is a leading zero (replaced with +44 for international calls from outside the UK) followed by the NNG — a 2, 3, 4 or 5 digit dialling code (digits SA in the example below) to different geographic areas of ...
List of dialling codes in the United Kingdom; List of UK dialling codes covering Wales; N. National Number Group; ... UK telephone code misconceptions; W. Whitehall 1212
1950s UK phone with letters on its rotary dial, as was typical for the time. When the UK's original STD codes were allocated in the late 1950s, London was given the code 01. Relatively few subscribers could dial trunk calls, so the 01 code was not generally included as part of the published telephone number.
The change affected the dialling codes assigned to Cardiff ... List of Wales dialling codes; UK telephone code misconceptions—includes the common "0207" and "0208 ...
This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...