What the international code for Sao Tome and Principe to call? Dial code number to open phone call in Sao Tome and Principe is ( 00239 ) or ( +239 ) in order to make international phone calls between Sao Tome and Principe and all countries of the world to unlock phone with more additional details and informations about Sao Tome and Principe country whereby each country is distinguished by a special telephone number, where the caller write the Democratic Republic of Sao Tome and Principe dial area code to opening sim card telephone line mobile or landline then the phone number.