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  2. 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 The 0500 range had NSN length as 9 digits only, and was withdrawn from use on 3 June 2017.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.

  3. 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.

  4. Non-geographic telephone numbers in the United Kingdom

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

    A non-geographic number is a type of telephone number that is not linked to any specific locality. Such numbers are an alternative to the traditional 'landline' numbers that are assigned geographically using a system of location-specific area codes. Non-geographic numbers are used for various reasons, from providing flexible routing of incoming ...

  5. List of telephone exchanges in London - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone...

    Telephones on automatic exchanges had letters as well as numbers marked on the telephone dial, and calls to London numbers used the first three letters of the exchange name followed by four digits, e.g. EUS 1234. [2] The number could be dialled as 387-1234 or spoken to a manual exchange operator as Euston 1234.

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

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

    Exchange names were usually closely tied to the physical location of telephone exchanges, being either the name of a city, town or village or district. The length of early telephone numbers depended on the number of subscribers attached to a particular exchange: if there were fewer than 10 subscribers, a single digit sufficed.

  7. List of telephone country codes - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_country...

    Telephone country codes are telephone number prefixes for reaching subscribers in foreign countries or areas by international direct dialing (IDD). Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164 and constitute the international telephone numbering plan of the public switched ...