I've an iPhone 4S running iOS 7. My wife's just bought an iPhone 5S running iOS 8. If i go... Settings > Mobile > then all my apps on my phone are listed. I can decide which ones I want to be 'allowed' to use mobile data. Under each app it also tells me how much data it has used since the last time i reset the counter. My wife's seems to be different. If she goes ... Settings > 'Cellular' (not mobile??) Then she has some listed, but not all her apps. Facebook, FaceTime, MC, Passbook, Settings Those are the only things listed, nothing else. Would be helpful if she could get something like what i have, to turn off which app uses mobile data & track how much each app is using.