What the international code for Cayman Islands to call? Dial code number to open phone call in Cayman Islands is ( 001345 ) or ( +1345 ) in order to make international phone calls between Cayman Islands and all countries of the world to unlock phone with more additional details and informations about Cayman Islands country whereby each country is distinguished by a special telephone number, where the caller write the Cayman Islands dial area code to opening sim card telephone line mobile or landline then the phone number.