AT&T and Sprint:
If you have AT&T or Sprint, your service will be the same as in the US Mainland – no roaming or extra charges of any kind. Watch your text messaging if you are traveling to St. John or the north or west side of St. Thomas. You can be without regular cell coverage and your phone will pick up a very expensive “at sea” coverage. In this case, you “should” receive a text message advising you about this. At this point you have the option to turn off your phone.
Verizon does not have coverage in the USVI but you can use voice, text, data, and email. Verizon has CDMA coverage only. Standard roaming per minute rate: $1.99