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– patterns for checking which area codes and prefixes are valid and patterns for formatting each number type, archived in 2014 "The first 25 years of UK STD code changes summarised" (PDF). Sam Hallas. May 2014. – detailed information and explanation "Area codes as they were in the early 1990s".
The 020 area code fully replaced older area codes for London on 22 April 2000, following multiple telephone number changes during the 1990s. [notes 1] As is the case for other codes in the UK, the 020 area code may also be used for services without any physical presence in the area, such as private networks or virtual numbering. [1]
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 ...
London manual exchanges were gradually converted to Director automatic exchanges from 1927. Holborn was the first, at midnight on Saturday 12 November, a local and tandem exchange. Bishopgate and Sloane exchanges followed in six weeks, then Western and Monument exchanges. The London area contained 80 exchanges, and full conversion was to take ...
It is a common misconception that London still has more than one area code (i.e. "0207", "0208" and even the later "0203" and "0204", which were the pre-1995 codes for Coventry and Bolton respectively). [133]
The BF postcode area was introduced in 2012 to provide optional postcodes for British Forces Post Office addresses, for consistency with the layout of other UK addresses. It uses the national non-geographic post town " BFPO " and, as of 2012, the postcode district "BF1".
From 1 June 1999, the new 020 code for London was introduced to replace the 0171 and 0181 codes, re-unifying the London telephone area under one code as it had been under the 01 area code. All the previous seven-digit numbers had a 7 or 8 prefixed to them: (0171) xxx xxxx became (020) 7xxx xxxx. (0181) xxx xxxx became (020) 8xxx xxxx.
Website. cityoflondon.gov.uk. The City of London, also known as the City, is a city, ceremonial county and local government district [ note 1 ] that contains the ancient centre, and constitutes, along with Canary Wharf, the primary central business district (CBD) of London and one of the leading financial centres of the world. [ 2 ]