What the international code for El Salvador to call? Dial code number to open phone call in El Salvador is ( 00503 ) or ( +503 ) in order to make international phone calls between El Salvador and all countries of the world to unlock phone with more additional details and informations about El Salvador country whereby each country is distinguished by a special telephone number, where the caller write the Republic of El Salvador dial area code to opening sim card telephone line mobile or landline then the phone number.