Because Android allows apps to wake up in the background and perform activities, there’s always the possibility they’ll send and receive mobile data without your knowledge. When you're on a low-capped data plan (or you're just coming up on the cap) this can be an issue. Luckily, the Android Data Usage menu in your phone offers information on what’s using data in the background, and could save you from extra charges.
7 restrict background data
Notice how Google+ background tasks use about three times the data of foreground tasks.
Below the graph of overall data usage mentioned above, you’ll find a list of all your apps organized by how much data they’ve used, starting with the most greedy offenders. Tap on any single app for details on the split between foreground and background data. If you find an app using a lot of bytes in the background, you can scroll down to the bottom of the details page and check the option to restrict background data. Note, however, that this option is only available on devices that hook into mobile data plans.
Also keep in mind that some apps won't work as expected with this option enabled, so only use it for apps and services that aren't respectful of your mobile data connection.
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