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List of country codes, international and national prefixes
List of country calling codes | USA, India, UK, Australia, & Canada
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International Calling Tip Sheet - Federal Communications Commission
International Calling Codes & Phone Numbers | Blue Ridge
What Country Has the 011 Code? - Reference.com
Calling International Numbers From The U.S. - How To Call Abroad …
List of international dialing codes by country - Worlddata.info
What does 011 stand for? - Abbreviations.com