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PokerGO on Twitter: "@SUDOnym3 Please enter your phone number as 44-next three digits-remainder of your phone number" / Twitter
What is the calling code for the United Kingdom? Making your phone c - Wise, formerly TransferWise
How to Call Canada from the UK: 7 Steps (with Pictures) - wikiHow
International Calling Codes: How to Dial to and from Europe & the US by Rick Steves
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History - Telephones UK
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