What the international code for Burundi to call? Dial code number to open phone call in Burundi is ( 00257 ) or ( +257 ) in order to make international phone calls between Burundi and all countries of the world to unlock phone with more additional details and informations about Burundi country whereby each country is distinguished by a special telephone number, where the caller write the Republic of Burundi dial area code to opening sim card telephone line mobile or landline then the phone number.