I have the T-Mobile Plan. It did work down in the BVI and USVI. I have found that in many locations around the world - the speeds drop to 2G. So, it did work but very slow down in the BVI. Faster in some areas near some towers. I ended up purchasing a digi-cell hotspot a couple of years ago and then just pick up a SIM. It is cheap and works great. I called the RoadTown store, the took by CC and had one all ready to go on the boat when I arrived. They were amazing to work with.