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This is a list of telephone dialling codes in the United Kingdom and the Crown ... Used up to the 1960s for internal telephones in the London Kingsway tunnels (LTK ...
In common with all other British area codes the initial '0' is a trunk prefix that is not required when dialling London from abroad. 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 ...
When dialling a UK number from abroad the zero is omitted and replaced by the calling country's international call prefix followed by 44, the country code for the UK. Thus a call to the Euston exchange discussed above from the United States would be to 011 (US international prefix) 44 20 (London) 73871234.
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 ...
"Telephone Area Code Tool - UK dialling code lookup". Ofcom. Archived from the original on 29 March 2014. "New telephone number range for Greater London (020) area" (PDF). Ofcom. 8 October 2004. Archived from the original (PDF) on 26 May 2011. "Telephone Numbering Program - The London Project" (PDF). Ofcom. 16 November 2004.
The installation of Unit Automatic Exchanges (UAX) from 1937 introduced local dialling codes for the first time outside the Director areas: subscribers could now directly dial calls to and from nearby automatic exchanges [8] using short dialling codes. Unlike Director codes or modern dialling codes, the code for a specific destination would ...
In the UK, area codes were first known as subscriber trunk dialling (STD) codes. Depending on local dialing plans, they are often necessary only when dialed from outside the code area or from mobile phones. In North America ten-digit dialing is required in areas with overlay numbering plans, in which multiple area codes are assigned to the same ...
Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, ... United Kingdom 44 +00:00 +01:00