How to rectify proximity sensor?1. If the screen guard covers the proximity sensor, it behaves erratically in 90%cases. Remove

screen guard and use only well aligned screen guards. If this doesn’t work use as follows.Simple solution without open your phone:Download this app: https://play.google.com/store/apps/details?id=com.itsme4ucz.screenoff

and so, do the following:

1. Screen On/Off ModesCheck "Cover and hold to turn on Screen"Timeout: 1 secondCheck "Disable Accidentla Lock"Timeout: 4 seconds

2. All settings Check "Disable in Lanscape"Check "Lock phone on screen ON"

3. [Advanced] Configure SensoreSelect sensor: Proximity sensorValue when sensor covered: 0Value when sensor un-covered: 1

Turn on the service and enjoy your phone calls.