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Old telephone area codes with letters UK: direct dialling
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London calling: Ofcom to release new '(020) 4' phone numbers - Ofcom
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UK Number Plate Area Codes Map. : r/JackSucksAtGeography
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UK Telephone NUMBERS and Local Search SEO [Phone - London] - Moz
Hall of Shame: UK Area Codes Home to Most Spam Calls
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UK Telephone NUMBERS and Local Search SEO [Phone - London] - Moz
Dialling Codes in Britain | Britain Visitor - Travel Guide To Britain
100 UK Codes ideas | coding, uk area, area codes
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United Kingdom country code, 44 phone code, +44 dialing code
