What the international code for Costa Rica to call? Dial code number to open phone call in Costa Rica is ( 00506 ) or ( +506 ) in order to make international phone calls between Costa Rica and all countries of the world to unlock phone with more additional details and informations about Costa Rica country whereby each country is distinguished by a special telephone number, where the caller write the Republic of Costa Rica dial area code to opening sim card telephone line mobile or landline then the phone number.