Telephone numbers in the United Kingdom - Wikipedia
https://en.m.wikipedia.org/wiki/Telephone_numbers_in_the_United_Kingdom
WEBCountry: United Kingdom: Continent: Europe: Regulator: Ofcom: Type: Open: NSN length: 7, 9, 10: Format: various, see text: Numbering plan: The National Telephone Numbering Plan: Last updated: 18 September 2010: Access codes; Country code: 44: International access: 00: Long-distance: 0: List of United Kingdom dialing codes
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