It's time for another cellphone thread

But since I searched and can't find the answer I'm looking for, I should be safe
Anyway, I have to travel to BVI for a few days, and I'm curious about cell service there. I can't find any details on cellphone coverage on the island, will my Sprint 800/1900MHZ CDMA handset work on the island (not likely), or should I take an unlocked GSM handset, etc.
If I need to take the unlocked handset, which SIM card should I bring/get?
Any and all help is appreciated.