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Its awesome, I can save my phone battery by switching it off and leaving only whatsapp on! boom!

No its not. Your phone needs to stay on the whole time.

Damn, you're right! That's a bit of a downer :(

Really.. I use a dumb feature phone and the only thing I want in is whatsapp..

Thought of signing in once with a smart phone and using it forever and continue using my dumb phone..