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In flight mode the connection to your network is turned off, so your phone can’t cause any interference with sensitive equipment in a plane or a hospital. You can still use your phone when flight mode is turned on, but you can’t send text messages or make calls. Follow these instructions to turn flight mode on or off.
Find "Manage Connections"
Turn flight mode on or off
When the box next to the menu item is empty, flight mode is turned off.