We are in Barcelona getting on magic tomorrow. I checked with sprint they told me that we can text internet unlimited free and phone calls are 20 cents a minute which to me sounds like it's too good to be true but 2 reps told me it was right. But they said while at sea make sure you have it on airplane mode and that you don't have these features while at sea only in ports Exactly what does the airport mode do. Just to be safe can I just turn my phone off. Also someone on another thread said make sure I have automatic apps off. What would these be. Thanks all