Wait for updates from Elliptical and Xiaomi. Restart. Press the power button when on call. Clean dirt from above the sensor. Update the software. Re-calibrate the proximity sensor. Alternatively. Reset the phone. Take it to a technician. Go to Settings >> About Phone >> Kernel. You need to tap on “Kernel” 4 to 5 times continuously before it gives you access to the “Hardware test” window. Find the “Proximity Sensor” and run the test to determine if the sensor is faulty or if re-calibration will do the trick. Select "Applications". Then "System application settings". Click on "Call settings". And go to the "Incoming calls" folder. In this menu, you have the option to activate or deactivate the proximity sensor, also known as the proximity sensor. It is generally recommended to disable this feature for a while and then re-enable it. 0HbseA.