Please forgive my dumb question, but I am not terribly technology savvy. If I put my phone on Airplane Mode while on the ship, will this prevent charges related to roaming, texts/calls coming through, etc? I want to be able to use the apps I have on my phone (specifically my white noise/digital clock app) but don't want the charges for being out of my area! I normally text a lot, and while most of my friends/family know about the trip, I'm sure a few will still text me while I'm gone. I don't want those coming through and causing charges! Thanks!