For all Verizon users sailing with us this week, will turning their phone to Airplane mode be all that is needed for them to not be charged a lot of extra fees while they are down? Or should they also take the further steps to turn off the cellular data roaming feature. My guess is the latter because we do intend to use cell phones when we go to shore to call home using FaceTime and that is probably when the data charges will kick in automatically unless we tell the phones not to. Any advice?