T-Mobile has recently rolled out global usage in more than 100 countries with most of their current plans with no additional charges, and Jamaica is on the list! While in Jamaica, you'll be able to send and receive text messages within JA and back to the USA, as well as have basic data service (128k speeds) for no additional charge, no roaming fees, nothing! Calls within JA and back to the USA will run 20 cents per minute.
This might help some of those who want to have a cell phone while travelling but don't want to go to the hassle of unlocking their device and having to get a SIM card while there. You'll also be using your normal phone number, not a temporary Jamaican one.
Not only that, if you're not a T-Mobile customer, this is a great time to make the switch - no contracts, an ever-expanding 4G LTE network, and you'll save money over AT+T/Verizon, as much as $1000's over the typical 2 year term the others lock you in for.
I work for T-Mobile, so if anyone has any questions please feel free to ask.