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When I turn off both my mobile data and my wifi, I get a strange notification

It looks like you have automatic synchronization enabled. The phone tries to connect to server and , surprisingly, fails. This can be caused by Google synchronization (altough Google could disable this in flight mode) or by other applications trying to syncronize data (Email, Facebok, ...). I have the automatic synchronization disabled and no warning appears when switching to flight mode.
 
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