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Learn about the structure, format and history of UK telephone numbers, including the country code 44 and the dialling codes for different regions and services. Find out how to call the UK from abroad and how to use the National Telephone Numbering Plan.
Learn how UK telephone numbers evolved from manual to automatic exchanges, from local codes to area codes, and from geographic to special services. Find out the origins, formats and examples of UK telephone numbers and their history.
Learn how telephone numbers are written and dialed in different countries and regions, according to the ITU recommendation E.123. Compare the formats, lengths, prefixes and codes of landline, mobile, toll free and service numbers.
Find the telephone dialling codes for different areas and services in the United Kingdom, based on the official standard maintained by Ofcom. Learn the history and changes of the UK phone code system, from the international prefix 00 to the area codes 01, 02, and 03.
Learn how to dial phone numbers in different European countries and territories, including country codes, national number lengths, and international access codes. Find out the European Union roaming and calling regulations and the harmonized service numbers.
E.164 is an ITU-T standard that defines a general format for international telephone numbers with up to fifteen digits. It includes country codes, global services, networks, groups of countries, and trials categories, and provides guidance on printing and DNS mapping of E.164 numbers.
E.123 is a standard by the ITU-T that provides guidelines for the presentation of telephone numbers, email addresses, and web addresses. It includes the international prefix symbol (+), the country code, and the local number, as well as other rules and formats.
Learn about the history and current status of UK telephone area codes, including the common confusion about the code for London. The correct code for most of Greater London is 020, not 0207, 0208 or 0203.