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– patterns for checking which area codes and prefixes are valid and patterns for formatting each number type, archived in 2014 "The first 25 years of UK STD code changes summarised" (PDF). Sam Hallas. May 2014. – detailed information and explanation "Area codes as they were in the early 1990s".
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 ...
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The postcode area is the largest geographical unit used and forms the initial characters of the alphanumeric UK postcode. [ 1] There are currently 121 geographic postcode areas in use in the UK and a further three often combined with these covering the Crown Dependencies of Guernsey, Jersey and Isle of Man.
The international vehicle registration code for the United Kingdom is UK. [2] Prior to 28 September 2021, it was GB. [3] The specification of plates incorporating the UK code was created by the British Number Plate Manufacturers Association, and is seen as the default design by the Department for Transport. [4]
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.
The misconception of area code and number separation is also seen in other areas of the country where the area code length was reduced in the Big Number Change such as Coventry being written as 02476 xxxxxx, whereas the correct number sequence is (024) 76xx xxxx (Coventry now has some (024) 77xx xxxx and (024) 75xx xxxx numbers) and Cardiff ...
From 1 June 1999, the new 020 code for London was introduced to replace the 0171 and 0181 codes, re-unifying the London telephone area under one code as it had been under the 01 area code. All the previous seven-digit numbers had a 7 or 8 prefixed to them: (0171) xxx xxxx became (020) 7xxx xxxx. (0181) xxx xxxx became (020) 8xxx xxxx.