Almost week after update to Android 7.
During the call sometimes phones screen became black(I still can speak and hear) and I cant disconnect the call or use any phone features untill the second side will drop the call.
What can I do?
You can try to recalibrate the Proximity sensor:
you can calibrate in engineer mode.
- type *#9646633# into the keypad of the phone app
- go to tab "Hardware Testing"
- open "sensor > Light proximity sensor > PS Calibration > Calibration > do calibration"