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Individual mobile phone companies are allocated different ranges within the 071xx, 073xx, 074xx, 075xx, 07624, 077xx, 078xx and 079xx prefixes. Changes to mobile phone numbers in the Big Number Change were mostly straight replacements, such as Vodafone customers on the 0378 block became 07778.
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 a list of telephone dialling codes in the United Kingdom and the Crown Dependencies, ... The number format '2+8' refers to, e.g. London, numbers using the ...
Telephones on automatic exchanges had letters as well as numbers marked on the telephone dial, and calls to London numbers used the first three letters of the exchange name followed by four digits, e.g. EUS 1234. [2] The number could be dialled as 387-1234 or spoken to a manual exchange operator as Euston 1234.
Further increased demand for telephone numbers in London led to the need for more number-space; rather than again split area codes, it was decided to merge the 0171 and 0181 area codes back into one but add an extra digit to the start of each London local number, thus increasing the available numbers by a factor of 5:
The Big Number change meant that London returned to a single area code again (as in the old 01 days), with no "inner/outer" split. Existing London numbers acquired the prefixes 7 or 8, but from that point on (020) 7xxx xxxx and (020) 8xxx xxxx numbers were assigned or reused anywhere in the London area covered by the single (city-wide) 020 code.
Each city with a director system was assigned a three-digit code, in which the second digit corresponded to the first letter of the city name on the telephone dial, except London which had the two-digit code 01. Codes were later changed (e.g., London became 020, and Manchester 0161). 01 London; 021 Birmingham; 031 Edinburgh; 041 Glasgow; 051 ...
Telephone number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4. It was later converted to AT4 to produce a 2L-5N telephone number. In large cities with coexisting manual and dial areas, the numbering was generally standardized to one format.