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The London area contained 80 exchanges, and full conversion was to take many years. [3] Until the late 1960s, some outer London exchanges did not offer direct dialling, and their numbers could be identified in the directory by being printed in light type, unlike normal exchanges, whose first three letters appeared in bold type.
Unlike the Crown Dependencies of Jersey, Guernsey and the Isle of Man which use the UK area codes 01534, 01481 and 01624, respectively, telephone numbers in British Overseas Territories do not come under the UK telephone numbering plan. Some are within the North American Numbering Plan (NANP). These calls are treated as international calls.
The 0800 range can have NSN length as 10, 9, or 7 digits. The 0845 range can have NSN length as 10 or 7 digits. The 0500 range had NSN length as 9 digits only, and was withdrawn from use on 3 June 2017. All other UK numbers have NSN length of 10 digits. There are no telephone numbers in the UK with an NSN length of 8 digits.
The first British telephone directory was published on 15 January 1880 by The Telephone Company. It contained 248 names and addresses of individuals and businesses in London; telephone numbers were not used at the time as subscribers were asked for by name at the exchange. [14]
The STD code 01 was assigned to the London telephone area on 6 April 1959 as part of preparations for subscriber trunk dialling. [12] For the next thirty years, "01" became synonymous with the capital. [13] Until May 1990, the 01 code covered the same area as the current 020 code and had capacity for fewer than 10 million telephone numbers. [14]
Beginning with London's director system, a need to automate telephone dialling resulted in every exchange being allocated either a unique Subscriber Trunk Dialling (STD) code or unique range of numbers within a wider dialling code area. For many years, calls dialled between nearby exchanges often required 'local codes' to select the most direct ...