Does anyone know exactly what constitutes “Data Usage”? What sort of activity counts against your monthly limit?
I tried both my local Apple and AT&T stores and there was no consensus. Most thought emails counted against the total, but weren’t sure about iTunes or app downloads, GPS usage, Location Services, eBooks downloads, etc.
Seems like there should be a definitive list somewhere.
(And yes, I did search this forum and didn't see a comprehensive answer.}