What the international code for Bhutan to call? Dial code number to open phone call in Bhutan is ( 00975 ) or ( +975 ) in order to make international phone calls between Bhutan and all countries of the world to unlock phone with more additional details and informations about Bhutan country whereby each country is distinguished by a special telephone number, where the caller write the Kingdom of Bhutan dial area code to opening sim card telephone line mobile or landline then the phone number.