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Specifications
Cause 1 of 7: Flight mode is turned on
When flight mode is turned on, all wireless Apple Watch connections are turned off, including the mobile network connection.
Solution: Turn off flight mode.
Turn flight mode on or off
Press the Side button.
Press the flight mode icon to turn the function on or off.
Return to the home screen
Press the Side button several times to return to the home screen.
Or choose...