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Country Codes, Phone Codes, Dialing Codes, Telephone Codes, ISO Country Codes - YouTube
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US country code: for WhatsApp, from UK, from India, Mexico
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International Calling Codes: How to Dial to and from Europe & the US by Rick Steves
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How to Call the US from India: 7 Steps (with Pictures) - wikiHow
List of country calling codes – Travel guide at Wikivoyage
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United States of America Area Codes / USA Area Code Map / Map of American Area Codes
What is the calling code for the United States? Making your phone ca - Wise, formerly TransferWise
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All Country Code Number List PDF Download – InstaPDF
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