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List of dialling codes. Short codes. 02x yyyy yyyy [eight-digit local number] 011x yyy yyyy [seven-digit local number] 01x1 yyy yyyy [seven-digit local number] 020 to 029. 0113 to 0119.
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 ...
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. Lists of numbers allocated to BT exchanges in the UK, including ...
Of the 16 area codes freed up for alternative use in the 1980s, at least 11 were re-used for other services. For example, the 0401 area code was re-allocated to Cellnet mobile services. Five of the area codes remained unused, including 01632, which is now partially reserved for fictitious telephone numbers. In 1995, the PhONEday changes for ...
Some widespread misunderstandings about area codes came about with the Big Number Change, most notably with London area codes. There is a widespread but erroneous assumption that London has several area codes – 0203, 0204, 0207 and 0208 – whereas, in fact, it has just one: 020. Similar misunderstandings came about with a few other area codes.
Each postcode area is further divided into post towns and postcode districts. [1] There are on average 20 postcode districts to a postcode area, [1] with ZE having the lowest (3) and BT the highest (81). The London post town is instead divided into several postcode areas. [2]
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
020. 020 is the national dialling code for London in the United Kingdom. All subscriber numbers within the area code consist of eight digits and it has capacity for approaching 100 million telephone numbers. The code is used at 170 telephone exchanges in and around Greater London as part of the largest linked numbering scheme in the United Kingdom.