What the international code for St Martin to call? Dial code number to open phone call in St Martin is ( 00599 ) or ( +599 ) in order to make international phone calls between St Martin and all countries of the world to unlock phone with more additional details and informations about St Martin country whereby each country is distinguished by a special telephone number, where the caller write the Sint Maarten Dutch part dial area code to opening sim card telephone line mobile or landline then the phone number.