If you have a GSM phone already (AT&T and T-Mobile in the US) your phone will just work in the BVI.
You can easily rent a local cell phone for the duration of your trip. The costs are not terrible.
Iridium is relatively expensive but pretty reliable.
Globalstar is an exercise in frustration.
You'll find wifi available in lots of places - generally every couple of days in a classic counterclockwise trip.
If you can see St. John in USVI (JVD, Cane Garden, most of Soper's, the outside of The Bight on Norman) whatever you have at home will work.
sail fast and eat well, dave
beware "cut and paste" sailors.
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