I think some setting has changed on my Android Note 2 but I don't know what:
only when the phone is connected to a Wifi service, will incoming/outgoing
whatsapp messages got received/sent.
It won't send/receive if I'm on data plan: I heard there's a setting somewhere
which I must have inadvertently set without realizing it. What's that?
However, while on Data plan, I can still receive/send SMS and calls
been accidentally unchecked again