Data Network Shuts off....

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So, my friend recently got this phone...
Its not even a week since he bought it....

We use WhatsApp Messenger to chat but there is one problem.

His Data Network is always on but when he going to sleep he keeps his Data Network "ON" but it actually goes into something like sleep mode....
My messages don't get delivered to him via WhatsApp.....

It's like every time he turns off his phones display, his Data Network goes onto sleep mode, doesn't matter What time of the day it is......

Does anyone have had this problem before and is there any solution to it?

By default the background data is switched off. You can change it in the setting.

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