So you turn on wifi and connect to the app = no cost. What would happen if something on your phone tried to use the wifi to connect and, for instance, download email without your prompting? Do you have to have logged on and affirmatively decided to pay for that to happen? I don't know why (since I don't even know that they'll have this on my cruise in November), but I'm obsessed about how this works with the on-board wifi and charges for that...