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Possible number formats for UK telephone numbers are: Number ranges starting 01 can have National Significant Number (NSN) length of 10 or (very rarely) 9 digits. NSN is the number of digits after the leading 0 trunk code or +44 international prefix. The 0800 range can have NSN length as 10, 9 or 7 digits.

List of mobile telephone prefixes by country Read Edit View history List of mobile telephone prefixes by country International prefixes table [ edit] See also [ edit] List of country calling codes Notes [ edit] ^ Mobile Prefix - The original prefix issued to the mobile network operator.

A telephone directory, commonly called a telephone book, telephone address book, phonebook, or the white and yellow pages, is a listing of telephone subscribers in a geographical area or subscribers to services provided by the organization that publishes the directory.

National Telephone Company (NTC) was a British telephone company from 1881 until 1911 which brought together smaller local companies in the early years of the telephone. Under the Telephone Transfer Act 1911 it was taken over by the General Post Office (GPO) in 1912.