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This is a list of telephone dialling codes in the United Kingdom, ... 0897 was never used as an area code 0897 later used for BT Premium rate numbers; changed from ...
This is the format used by most areas. It has a four-digit area code (after the initial zero) and a six digit subscriber number, and is known as 4+6 format. These area codes were changed by adding a "1" directly after the initial zero as a part of PhONEday in 1995. Just short of 581 areas use this format, and the area codes range from 01200 to ...
Each postcode area is further divided into post towns and postcode districts. [1] There are on average 20 postcode districts to a postcode area, [1] with ZE having the lowest (3) and BT the highest (81). The London post town is instead divided into several postcode areas. [2]
The remainder of the "mixed" area code allocations and their history are detailed in the table below. Of the 11 area codes freed up for alternative use in the 1980s, only 5 were actually re-used for other services. For example, the 0541 area code was re-allocated to C&WC Area Call services. Six of the area codes remained unused.
As the telephone system was modernised and liberalised with multiple telephone companies and numbers became portable, the rigid correspondence of numeric codes to exchanges was relaxed, but even today it is likely that a (7)387 number, for example, is located in the Euston area. Lists of numbers allocated to BT exchanges in the UK, including ...
The BT postcode area, also known as the Belfast postcode area, [2] covers all of Northern Ireland and was the last part of the United Kingdom to be coded, between 1970 and 1974. [ citation needed ] This area is a group of 82 postcode districts in Northern Ireland, within 44 post towns and around 47,227 live postcodes.
During the 1980s, free-to-caller numbers were introduced using a range of prefixes that had previously been used as geographic area codes. By the 1990s, the prefixes 0321, 0500 and 0800 were all in use and allocated to Vodafone, Mercury Communications and BT respectively.
The original 091 area code was introduced in 1982 and phased in over a period of approximately five years. It was the newest two-figure STD code since the STD system was introduced into the UK, prior to London being split into two STD codes (071 and 081). It was later changed to 0191 as a part of PhONEday.