Cause 2 of 11: Flight mode is turned on
When flight mode is turned on, all wireless connections on the phone are turned off, including the connection to the mobile network.
Solution: Turn off flight mode.
Turn flight mode on or off
Slide two fingers downwards starting from the top of the screen.
Turn flight mode on or off
Press the flight mode icon to turn the function on or off.
Return to the home screen
Press the Home key to return to the home screen.