What the international code for Guyana to call? Dial code number to open phone call in Guyana is ( 00592 ) or ( +592 ) in order to make international phone calls between Guyana and all countries of the world to unlock phone with more additional details and informations about Guyana country whereby each country is distinguished by a special telephone number, where the caller write the Co-operative Republic of Guyana dial area code to opening sim card telephone line mobile or landline then the phone number.