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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.
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 ...
From the introduction of the telephone in the late 1870s, to the early 1990s, telephone numbers in most of the United Kingdom were usually shown with a written exchange name followed by the subscriber number, e.g. 'Mallaig 10' or 'Aberdeen 43342'. This allowed calls to be placed initially through the operator and later by using local or ...
PhONEday was a change to telephone numbering in the United Kingdom on Sunday 16 April 1995. A shortage of unique telephone numbers in the old dialling system meant that it was becoming increasingly difficult in certain areas of the country to assign unique numbers to new subscribers.
Fictitious numbers in (011x) and (01x1) area codes mostly end with the digits 496 0xxx, however Tyneside uses (0191) 498 0xxx. London uses 020 7946 0xxx; Cardiff uses 029 2018 0xxx; and Northern Ireland now uses 028 9649 6xxx after a previously reserved range was allocated for actual use.
Widespread UK telephone code misconceptions, in particular brought on by the Big Number Change in 2000, have been reported by regulator Ofcom since publication of a report it commissioned in 2004. The telephone area code for most of Greater London and some surrounding areas is 020, not "0207", "0208" or "0203".
Random digit dialing (RDD) is a method for selecting people for involvement in telephone statistical surveys by generating telephone numbers at random. Random digit dialing has the advantage that it includes unlisted numbers that would be missed if the numbers were selected from a phone book.
A non-geographic number is a type of telephone number that is not linked to any specific locality. Such numbers are an alternative to the traditional 'landline' numbers that are assigned geographically using a system of location-specific area codes.
Personal numbering is the name for the virtual telephone number service in the UK. Typically the national destination code used for this service is (0)70. The service provides a flexible virtual telephone number able to be routed to any other number, including international mobiles.
A telephone number serves as an address for switching telephone calls using a system of destination code routing. Telephone numbers are entered or dialed by a calling party on the originating telephone set, which transmits the sequence of digits in the process of signaling to a telephone exchange.