Hi,
I just purchased a Nokia 930. It also has the issue that proximity sensor does not work properly and the screen is black during a phone call. If I clean the area on top of the phone (above Nokia logo) then I get a few seconds of screen on so that at least
I can end the call.
Browsing the Internet it seems that this is a problem which still affects all Lumia phones. Old and new ones. Reasons I could find so far: dust in the sensor (can that be the case for a new phone??), too sensitive sensor, dirty glass. I personally believe
that it is a combination of firmware-sensor-OS.
Nokia people, are you aware of these issues? Any plans to address them? How about starting with a simple patch to allow disabling this sensor? It is outrageous that you buy a phone which you cannot use it as a phone.
I hope that someone from Nokia will read this post...
Gia