International Calling Codes: How to Dial to and from Europe & the US by Rick Steves
UK Phone Number Format: Your Ultimate Reference Guide
Telephone area codes: Find UK dialling codes for numbers starting 01 and 02 - Ofcom
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How to Call the United Kingdom from the US [+ Area Codes]
London calling: Ofcom to release new '(020) 4' phone numbers | Ofcom | Official Press Release
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How to Call the United Kingdom from the US [+ Area Codes]
Telephone numbers in Europe - Wikipedia
UK Phone Number Format: Your Ultimate Reference Guide
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UK Telephone NUMBERS and Local Search SEO [Phone - London] - Moz
British Telecom Easy Reference Guide to the London Phone Code Change, 6 May 1987 | eBay
What is the calling code for the UK? - Wise
A symbol of a telephone and the +44 UK national phone code Stock Photo - Alamy
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UK Telephone NUMBERS and Local Search SEO [Phone - London] - Moz
UK Area Codes | Telephone Area Codes | The Phone Book from BT
Telephone Numbers in English - How to say phone numbers - YouTube
What is an 0203 Number Anyway | eReceptionist
International Calling Codes | Telephone Country Codes List
How to Call the UK from the US | Mobile & Landline Dialing Guide
020 - Wikipedia
UK Phone Number Format: Your Ultimate Reference Guide
How phone numbers changed through the 20th Century in the UK
Dialling Codes in Britain | Britain Visitor - Travel Guide To Britain
