International calling code 1 belongs to: American Samoa, Anguilla, Antigua and Barbuda, Bahamas, Barbados, Bermuda, Canada, Cayman Islands, Dominica, Dominican Republic, Grenada, Guam, Jamaica, Montserrat, Northern Mariana Islands, Puerto Rico, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Trinidad and Tobago, Turks and Caicos Islands, United States, Virgin Islands- British, Virgin Islands- US.

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