Hello, We are going to the states in a few weeks and as far as I know we do not need to do anything regarding choosing a phone network when we get there, We are both with meteor, My wife has an I phone and I have a bog standard galaxy, We will top up before we go but are the charges very high if we ring each other when over there , Also do we need to put in an added number before ringing each other, Any help would be appreciated, Regards Salaried.