iOS 7 How to Guides: Get the Most Out of iOS 7

How to Stop Apps from Using Mobile Data in iOS 7

Apple now lets users track how much data an app is using on LTE or 3G, which makes it easy to identify apps hogging your precious data. With this new feature users can also see how much data they use on a personal hotspot.

Read: How to Stop an App from Using Data on iOS 7

That's not all. If you need to stop one app from using cellular data you can toggle access off, which is a good way to keep rogue apps from eating through your limited data plan.