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National conventions for writing telephone numbers vary by country. The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. Recommendation E.123 specifies the format of telephone numbers assigned to telephones and similar communication endpoints in national telephone ...
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.
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. Country codes are dialed before the national telephone number, but require at least one additional prefix, the international call prefix which is an exit code from the national numbering plan to the international one. In ...
This is a list of telephone dialling codes in the United Kingdom, 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. This list is based on the official standard, but includes defunct codes and historical ...
List of mobile telephone prefixes by country Parts of this article (those related to table) need to be updated. The reason given is: much information is outdated, a flag of number portability may need to be added. April 2024 This is a list of mobile telephone prefixes by country.
List of emergency telephone numbers In many countries, dialing either 112 (used in Europe and parts of Asia) or 911 (used mostly in the Americas) will connect callers to the local emergency services. But not all countries use those emergency telephone numbers. The emergency numbers in the world (but not necessarily all of them) are listed below. 112 911 999 110 117 17 100 119 15 113 191 10 111 ...
E.164 defines a general format for international telephone numbers. Plan-conforming telephone numbers are limited to only digits and to a maximum of fifteen digits. [1] The specification divides the digit string into a country code of one to three digits, and the subscriber telephone number of a maximum of twelve digits.
History of telephone numbers in the United Kingdom Telephone numbers in the United Kingdom have a flexible structure that reflects their historical demands, starting from many independent companies through a nationalised near-monopoly, to a system that supports many different services, including cellular phones, which were not envisaged when the system was first built. Numbers evolved in a ...