when you open the apps, they stay open even though you click to close them they are still running. You have to double click the main button at the bottom of phone and the screen will slide up and show you waht is still open then you have to hold one of the apps for a few seconds and they start to wiggle and a red circle appears at the corner of the apps, then you click that to close them.
Its possible your friend is constantly running several internet apps all the time.
I was told this runs down the battery and uses up data.
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