What the international code for Guinea Bissau to call? Dial code number to open phone call in Guinea Bissau is ( 00245 ) or ( +245 ) in order to make international phone calls between Guinea Bissau and all countries of the world to unlock phone with more additional details and informations about Guinea Bissau country whereby each country is distinguished by a special telephone number, where the caller write the Republic of Guinea-Bissau dial area code to opening sim card telephone line mobile or landline then the phone number.