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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]
The following exchanges are located outside Greater London, but use the London 020 dial code. OLO [5] code Exchange name District, County Dial code LWBUS: Bushey Heath:
The code 0999 was used for dialling by PO operators only to mobile relief exchanges in the Glasgow area in the 1970s. ... Geographic area code 2+8 only: 10: 020, 023 ...
A single charge group code would usually cover multiple exchanges in various locations, which were identified either by a linked numbering scheme or extended codes. This meant that many exchanges were given alphanumeric STD codes that did not relate to their names: Swallow's code of 0GR 289 only made sense if you knew it was connected to ...
Some widespread misunderstandings about area codes came about with the Big Number Change, most notably with London area codes. There is a widespread but erroneous assumption that London has several area codes – 0203, 0204, 0207 and 0208 – whereas, in fact, it has just one: 020. Similar misunderstandings came about with a few other area codes.
The telephone area code for most of Greater London and some surrounding areas is 020, not "0207", "0208" or "0203". [2] A study was commissioned in 2005 which found that only 13 per cent of respondents correctly identified the 020 code for London without prompting: 59 per cent incorrectly identified it as "0207" or "0208". [3]
This leads to a restriction as to which initial digits can be used for subscriber numbers within those four-digit area codes, e.g. in the 01387 four-digit area code, subscriber numbers cannot begin with a 3 because 013873 is a separate five-digit area code; likewise in the 01946 four-digit area code, subscriber numbers cannot begin with a 7 ...
In some cases, a local call to a number just across an area code boundary could be seven digits if an exchange code protection scheme prevented the same prefixes being assigned to local numbers in the other area code. A long-distance trunk call within the same area code used to be dialable as 1 followed by seven digits, without the area code ...