What the international code for United States Virgin Islands to call? Dial code number to open phone call in United States Virgin Islands is ( 001340 ) or ( +1340 ) in order to make international phone calls between United States Virgin Islands and all countries of the world to unlock phone with more additional details and informations about United States Virgin Islands country whereby each country is distinguished by a special telephone number, where the caller write the United States Virgin Islands dial area code to opening sim card telephone line mobile or landline then the phone number.