HTC One (M8)

You can't make voice calls - HTC One (M8)

Cause 2 of 9: Flight mode is turned on

If flight mode is turned on, you can't make or receive calls.

Solution: Turn off flight mode.

Step 1 of 3

Turn flight mode on or off

Press and hold On/Off.

Step 2 of 3

Turn flight mode on or off

Press Airplane mode.
Depending on the current setting, flight mode is turned on or off.

Step 3 of 3

Turn flight mode on or off

If you turn off flight mode:
Key in your PIN and press OK.

Press and hold On/Off.

Press Airplane mode.
Depending on the current setting, flight mode is turned on or off.

If you turn off flight mode:
Key in your PIN and press OK.