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List of country calling codes | USA, India, UK, Australia, & Canada
Understanding international country codes - Verizon
What Country Has the 011 Code? - Reference.com
List of international call prefixes - Wikipedia
International direct dialing - Wikipedia
International Calling Tip Sheet - Federal Communications Commission
International Calling Codes & Phone Numbers | Blue Ridge
Where is area code 011? - Answers
What does 011 stand for? - Abbreviations.com
List of international dialing codes by country - Worlddata.info