I will be arriving in Punta Cana Jan.18 and would like to be able to purchase a SIM card so that I can call home. I will be staying at the Melia Caribe and am wondering if anyone knows if I can pick up a SIM card at the resort. I was hoping to purchase one prior to arriving but this does not seem possible. (??? is it?) I have an unlocked phone ready for the trip, just looking for a little guidance on how to get a card. Thanks!