I have galaxy s4 activated not in contract. I also have my old Moto Razr not activated. When I travel to Jamaica (or anywhere international) I need to figure out how I do the international thing with sim card. If I travel there, then I go on roaming and it costs a ton. Do I just go down there and get a sim card? how do I pay then. This topic is to broad on the internet and seems to be different per device. Is phone unlocked or does it have to be?