Almost since I got my Sirocco and even before updating to Pie, I have this issue.
When I start a call, regardless what app I'm using (phone, contacts or Telegram) the screen goes off. This issue ONLY happens outdoors under bright sun light. I noticed that in order for the screen to turn back on is by exposing the proximity sensor to bright light source, strong sun light or spot light for example. If I went from outdoors to indoors, the screen would go off and not respond. However, if I started the call indoor under normal light conditions and went outdoors. It works flawlessly. In case I locked the phone, unlocked it and started a call outdoor, it would do it again and I face the same issue. To make sure it's not a hardware problem, I did hardware test for proximity sensor. I used hardware test in the phone app and multitool sensor reading app. Indoors, when it behaves as it should. I get a valid readings. Indoors, when it behaves as it should. I get a valid readings. Zero when sensor is covered and 5 when not even when I take it outdoor without locking the device. As for outdoors, I get zero centimeters all the time, even when I get inside. When I expose it to sunlight or bright, I get zero when covered and 5 when not as it suppose to. I also noticed that the screen brightness stays maximum when I got from outdoor to indoor.
This is definitely a software issue. I tried contacting Nokia support many times and they just keep telling me the same non sense, to try another calling app or make sure no screen protector is installed (there isn't ). Restarting the phone fixes the problem, then it's repeated the next day.
Any help please 😭