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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.
The director telephone system was a development of the Strowger or step-by-step (SXS) switching system used in London and five other large cities in the UK from the 1920s to the 1980s. A large proportion (c. 70% to 80%) of telephone traffic in large metropolitan areas is outgoing traffic, and it is distributed over many exchanges.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [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 ...
The first major change was in May 1990, when the London 01 area code was replaced with 071 and 081. Local numbers remained seven digits long. Exchanges in central London used the 071 code. The remaining exchanges now used the 081 code and formed a ring around the 071 area. [34]
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, which adopts an open telephone numbering plan for its public switched telephone network. The national telephone numbering plan is maintained by Ofcom, an independent regulator and competition authority for the UK communications industries. This list is ...
Walton-on-Thames was a very well interconnected telephone exchange with a tidy arrangement of local dialling codes: 9 was the code for its parent Weybridge; 8 was the code for a direct connection to Esher; 5x were the codes for direct connections to other non-director exchanges; 6x were the codes for direct connections to nearby London director ...