What the international code for Liberia to call? Dial code number to open phone call in Liberia is ( 00231 ) or ( +231 ) in order to make international phone calls between Liberia and all countries of the world to unlock phone with more additional details and informations about Liberia country whereby each country is distinguished by a special telephone number, where the caller write the Republic of Liberia dial area code to opening sim card telephone line mobile or landline then the phone number.