We are teaching a Cruise Planning class for the USPS and have several class members who are heading to the Bahamas this year. They have questions about using their current cell phones. We have told them about purchasing a SIM card in the Bahamas for their phones and they are good with that. But they would like to know what coverage they will have WITH the SIM card. How close do the need to be to a BATELCO tower with the cell phone with the SIM card installed. AT&T, Verizon, and Sprint are all represented in the class. We have also told them about phone cards, but they are really wanting to make sure that they are covered while they are on the boat without going to the expense of a satellite phone.