I have had my 9790 for around 5 months. Currently running 7.1 software. Until recently, whenever I was in a call and put the phone up to my ear, the screen would switch off. As soon as I moved the phone away from my ear the screen would power up again. I assumed this is some sort of power saving feature?
Well, in the last week or so, it has stopped doing this. Screen just stays on during the call, until it times out normally, then stays off unless I press a button?
Is this something I might have disabled accidentally in the settings or could it be a faulty sensor or something?
another way to test it is making a call and putting your finger over to the left of the the notification led, if you see it very well you can see the proximity sensor ...