There is a light sensor that kills the screen during a call when you put the phone to your ear so you don't press any numbers with your ear. This is buggered on yours, killing the display every time you make a call.
I had this when i smashed my screen over where the sensor is. Then when I got the screen replaced, the opposite happened, it wouldn't kill the screen so i would end up muting the call or putting it on to speaker phone accidentally
There is a light sensor that kills the screen during a call when you put the phone to your ear so you don't press any numbers with your ear. This is buggered on yours, killing the display every time you make a call.
I had this when i smashed my screen over where the sensor is. Then when I got the screen replaced, the opposite happened, it wouldn't kill the screen so i would end up muting the call or putting it on to speaker phone accidentally