I have just spent 2+ hours trying to get my voice messages and make calls with my Samsung Note 3, using a Verizon unlimited Voice & Text, Plus 2GB data Plan from several locations in St. Croix, USVI. I have tried to chat with Verizon Support, but no chat services seem to be available, although I have a good WiFi connection from my Villa and can get plenty of eMails and URLs anywhere in the world!
Verizon Support seems to be the worst on the planet, quite a distinction as customer service is an arcane art used to test the emotional fortitude and character of intelligent human beings. Actually, intelligent human beings avoid any customer service like the plague, as do I in normal circumstances. However, since the Verizon web site provided no answers or self service capabilities for providing service in St. Croix, I was left with engaging their support organization. Do not waste your time. Unless you can wrap your hands around the throat of a Verizon representative, I would suggest other ways to waste your time.
Strangely enough, I get 3 and 4 bars of signal quality on my phone, yet no calls come inbound or are successfully made outbound, in over a week from various locations on St. Croix. Seems I can ignore their coverage map for this island. PS - there are no hurricanes or weather conditions that could affect signal quality at this time.