I have such a stupid question that I wish I could ask it anonymously. New phone and new iOS, manual backup from my desktop. I was outside today, and the phone wouldn't allow me listen to my music unless I was on cellular data or wifi. Same thing with the calendar. I know this is stupid, but why? Clearly I don't want to use cellular data when I'm listening to my own library, calendaring, etc. What am I missing? (I've come from a 5, where none of this applied). I've roamed settings, and I can't seem to figure this out.
In advance, thank you.
PS, not noticing any huge advantage on battery, either.