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As the telephone system was modernised and liberalised with multiple telephone companies and numbers became portable, the rigid correspondence of numeric codes to exchanges was relaxed, but even today it is likely that a (7)387 number, for example, is located in the Euston area.
Brand new area code allocation post-BigNumber for a new town, chosen to be significantly different from the area codes of the adjacent areas of Gravesend and Dartford. [14] 01988 — Wigtown (WT8) 01989 — Ross-on-Wye, Wye Valley (WV9) 01990 — unused; 0990 was Wentworth (WW0) – numbers were transferred to 0344 [notes 14]
The new area code retains both of the old area code names. A diagram showing the principle is shown on page 9 of Oftel's telephone numbering guide [ 32 ] and these areas are shown in the table below. [ 33 ]
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]
However, in Director telephone areas such as the London telephone area, the changes permitted many new exchange codes to be issued that did not correspond to letters representing the geographic locations. As '1' was also available for the 'B' and 'C' digits, this allowed many more exchange codes such as 211, 212, 221 to be used.
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 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 ...
PhONEday followed a change made in May 1990, when the old London area code 01 was released from use, permitting all United Kingdom geographic numbers to begin with this prefix. Originally planned in 1991 to take place in 1994, [ 2 ] in 1992 the change was postponed until the Easter Sunday bank holiday in 1995.