Will my Cellphone work in St Thomas?

Answer: yes if it is AT&T  or Sprint.  No if it Verizon Wireless or T-Mobile.

As far as reception is concerned there are plenty of mountains so there are plenty of dead spots.  Data connections are not too bad.

If you happen to be by a cruise ship chances are your cellphone won’t work their either.  Rarely can I get my Sprint phone to work at Havensight when I am right next to a cruise ship.