Device Guides
Apple iPhone 7 Plus
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iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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I can't make voice calls
This troubleshooting guide will take you through a number of possible causes
to help you find a solution to your problem.
Turn off flight mode.
Possible cause 5:
Flight mode is turned on
Solution:
Turn flight mode on or off
Slide your finger upwards starting from the bottom of the screen.
Tap the flight mode icon to turn the function on or off.
Return to the home screen
Tap the Home key to return to the home screen.