You can also enable or disable cellular data for certain iOS apps and features from this setting.
Choose Settings > Cellular to view the cellular data usage for each app. Tap to turn off cellular data for an app.
Unfortunately, this feature seems to have stopped working with iOS 7.1.2. I went over my 200 MB bandwidth limit in both July and August—having never done so before. Apps such as OmniFocus and Overcast, which I’ve always set to not use cellular data, used tens of MB of data each month.
Omni seems to have received other reports of this problem and explained how I could turn off automatic syncing in OmniFocus. I think this helped, but the app has still used 5 MB of data in the last four days, when it shouldn’t have used any at all.
Update (2014-09-18): My initial impression is that iOS 8 fixes this bug, although it continually pops up alerts telling me that cellular data is turned off.
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