iPhone 12
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I can't make voice calls
Solution 3 of 8: Flight mode is turned on
You can turn off all wireless connections so your phone can’t cause any interference with sensitive equipment in a plane or a hospital. You can use many phone functions when flight mode is turned on, but you can't send messages or make calls.
Slide your finger downwards starting from the top right side of the screen.
Press the flight mode icon to turn the function on or off.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.