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  2. History of telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/History_of_telephone...

    The change was in response to a lack of free numbers in these areas. By requiring the area code for all local calls, Ofcom are able to allocate numbers starting with 1 or 0. This increases the number of telephone numbers available without requiring a number change. [131]

  3. Telephone numbers in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    The 0800 range can have NSN length as 10, 9, or 7 digits. The 0845 range can have NSN length as 10 or 7 digits. The 0500 range had NSN length as 9 digits only, and was withdrawn from use on 3 June 2017. All other UK numbers have NSN length of 10 digits. There are no telephone numbers in the UK with an NSN length of 8 digits.

  4. List of dialling codes in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/List_of_dialling_codes_in...

    "Regular Expressions for Validating and Formatting GB Telephone Numbers". aa-asterisk.org.uk. Archived from the original on 6 April 2014 – 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.

  5. Telecommunications in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_in_the...

    Telecommunications in the United Kingdom have evolved from the early days of the telegraph to modern fibre broadband and high-speed 5G networks. History Company logo on porch of 17 & 19 Newhall Street, Birmingham (former Central exchange) National Telephone Company (NTC) was a British telephone company from 1881 until 1911, which brought together smaller local companies in the early years of ...

  6. Non-geographic telephone numbers in the United Kingdom

    en.wikipedia.org/wiki/Non-geographic_telephone...

    The original range of telephone numbers starting '03' was progressively cleared between 1995 and 2001: former geographic area codes starting 03 were renumbered to start 013 during the national PhONEday renumbering, while premium rate, local rate and mobile phone prefixes such as 0331, 0345, and 0378 were transferred to a simplified structure of ...

  7. All-figure dialling - Wikipedia

    en.wikipedia.org/wiki/All-figure_dialling

    The codes allowed subscribers to call other exchanges directly and without the assistance of an operator. To help the public remember the new codes they were represented by a recognisable combination of two letters and a number. Outside the director areas, at least three character codes were dialled after an initial '0' which gave trunk access ...

  8. Big Number Change - Wikipedia

    en.wikipedia.org/wiki/Big_Number_Change

    With PhONEday in 1995 and the Big Number Change, the UK had achieved huge spare capacity for new services and simple to understand prefix groupings: 01 and 02 for geographic numbers, 070 for personal numbers, 076 for pagers, 07624, 077, 078 and 079 for mobiles, 0500 and 080 for freephone, 084 and 087 for non-geographic and 090 for premium rate ...

  9. Telephone number - Wikipedia

    en.wikipedia.org/wiki/Telephone_number

    For most countries, this is followed by an area code, city code or service number code and the subscriber number, which might consist of the code for a particular telephone exchange. ITU-T recommendation E.123 describes how to represent an international telephone number in writing or print, starting with a plus sign ("+") and the country code.