The ship wants you to use the App for so many things, before and during the cruise. Treat yourself to a new more powerful phone. Personally I hate the App and if I was not travelling with 2 younguns who are used to using their phones for everything, I would be lost. If you can start to learn the App before sailing, just trying different things on it, that will help you learn it for the ship.There is a desk onboard where they can get you started. One trick on board is to place cell phone in airplane mode.