Hi. There are other posts dealing with this but I can't find any the same as my problem. I'm trying to pay a bill and I can't ring automated services as these require key pad access. The very moment I hit call, the screen goes black. The proximity sensor is totally uncovered and I purposefully left it clear to test was that the issue. When I double tap the screen that hangs up the call. Seriously frustrating to have such a good phone office in this area by a Nokia 3310! How do I sort this? Also, people are saying to install an app that keeps the screen on for selected apps. But I would like to have my backlight automatically switch off, in the way it is supposed to, if possible. Thanks.