What the international code for Grenada to call? Dial code number to open phone call in Grenada is ( 001473 ) or ( +1473 ) in order to make international phone calls between Grenada and all countries of the world to unlock phone with more additional details and informations about Grenada country whereby each country is distinguished by a special telephone number, where the caller write the Grenada dial area code to opening sim card telephone line mobile or landline then the phone number.