What the international code for Oman to call? Dial code number to open phone call in Oman is ( 00968 ) or ( +968 ) in order to make international phone calls between Oman and all countries of the world to unlock phone with more additional details and informations about Oman country whereby each country is distinguished by a special telephone number, where the caller write the Sultanate of Oman dial area code to opening sim card telephone line mobile or landline then the phone number.