What the international code for Eritrea to call? Dial code number to open phone call in Eritrea is ( 00291 ) or ( +291 ) in order to make international phone calls between Eritrea and all countries of the world to unlock phone with more additional details and informations about Eritrea country whereby each country is distinguished by a special telephone number, where the caller write the State of Eritrea dial area code to opening sim card telephone line mobile or landline then the phone number.