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020: London [notes 1] [4] [5 ... numbers prefixed by 75 and transferred to 01595 on PhONE day. ... This enables local numbers to start with 0 or 1 and was introduced ...
Only certain sub-parts of each code were made available for immediate use. Numbers at 0845 7, 0845 9, 0870 1, 0870 4, 0870 5 and other ranges were set aside for numbers such as 0345, 0374, 0541, 0645 and 0990 that would be migrating from 9-digits to 10-digits and to these two 08xx codes in the forthcoming Big Number Change in 2000.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
This is used for forty smaller towns which have a mixture of six and five digit local numbers, each type allocated in specific DE blocks*; e.g. in the 01647 area code numbers beginning 24 and 61 have five digits (24xxx and 61xxx; known as 4+5 format) whereas all other DE blocks* within that area code have six digit numbers.
From 1 June 1999, London numbers could additionally be dialled with the new 8 digit number but it had to be preceded by the new area code 020 (or international equivalent). From 22 April 2000, the 0171 and 0181 codes stopped working and callers dialling an 020 number from another 020 number could omit the 020 (in keeping with local dialling ...
Mobile phones use the same area codes as landline telephones, but the number begins with a "15", added to a string of 6, 7 or 8 digits, just as described above. After the "15", the remainder of the number can start with a 3, a 4, a 5 or a 6. This "15" may be dropped when a call is made to a mobile phone in a different code area.
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
The reunification under a single code created capacity for approaching 100 million telephone numbers [14] and, starting in 2005, subscriber numbers beginning with the digit "3" were issued alongside those beginning "7" and "8". [14] In August 2019, Ofcom announced that subscriber numbers beginning with the digit "4" will also be introduced. [19]