How can one tell that an app has been closed and is not running in the background and using up data?
When navigating the menu, does an app automatically close when you leave the page that you were on?
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If you tap and hold the back button on your phone, it will popup a list of running/suspended apps. You can switch to the app and press the back button until the app closes, or you may use the exit/quit option if the app has either of them.
Even if the main app is closed, there may be background agents for the app. To disable background tasks, go to Settings, swipe left, tap on background tasks and block unneeded background tasks.