There’s a lot that you can do to stop your Android phone from eating up all your data, but one of the easiest places to start is to understand how each app you have installed uses data. Luckily, that information is very easy to find. (If you’re an iOS user, you can also find out how to track data usage of individual apps on iPhones and iPads.) Go to Settings > Data Usage to find out how much data each of your apps are using.