Ok great, so everything works now?
Yes, if I avoid any little fingerprint on the proximity sensor 
I moved our posts here as I think this is the same problem.
Maybe the proximity sensor is extra sensible during calls and therefore reacts even to fingerprints and screen protector foils.
One might argue that this over-sensitivity is a bug. What do you guys think? (Can you reproduce it by smearing the sensor or using a foil?)
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Hello,
it seems to be the same problem. Just a little smear (e.g. from “face grease” from a previous telephone call) or a fingerprint on the display at the position of the proximity sensor is enough to activate the lock screen. Even holding a finger 5cm away from the proximity sensor activates the lock screen. In the beginning, I thought it was a software bug since, in addition, I had an audio problem. But this was due to a microphone bug in the IPhone that I had used for testing; so this problem has been resolved.
However, I’ve just tested it with a few objects. A (transparent) plastic foil, a greasy finger print, a (transparent) plastic cover or glass are suitable for activating the lock screen with the sensor. Or just holding your finger a few centimeters above the sensor (even in the vicinity of bright light).
My solution for now is to keep the display very clean at all times.
My screen went black while talking when I used headphones/earplugs. even when i disconnected the headphones the screen stays off. Maybe there is a tiny short signal from the headphones port, so the fairphones assumes someone plugged headphones in.
In my case I simply could turn on the screen with the power button although I configured it to end calls.
I think in my case it works as it should. I can wake the screen with the power button and end the call by pressing a second time.
Maybe the problem could be fixed if the srceen turns back on when unplugging a headphone.
Maybe your problem could be connected to this?
I actually don’t have a Problem. I just wanted to point out, that I could turn on the screen with the powerbutton. And maybe there is a connection to the headphones jack
I just had a similar issue:
- Made a call
- The person didn’t answer and I ended up on the voicemail
- I wanted to end the call
- I removed the phone from my ear, the screen remained black
- Touching the screen didn’t work, all the physical button didn’t work
- The call was still going on (and I was being recorded on voicemail), so I had to hard reboot the phone
I’ll try and see if it happens again after making sure nothing blocks the proximity sensor
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Hallo,
when i get called, the screen turns black, immediatly as i accept the call, (not because it’s close to my Head) and it is not possible turn it on, except the other person hangs up.
greetings from munich, germany!
michi
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Does it make a difference if you clean the proximity sensor before you call someone?
Hallo,
no, i don’t think so. Sometimes it works as it should. I did the thumb test during a call, when it worked and the Sensor did his job, even with greasy fingers. About every second call, weather it is incoming during lock screen or while i use the phone, there appears this problem. When its an incoming call the screen turns black as i accept it and only turns back in when the other Person ends the call. When i call someon it sometimes turns black correctly when it comes near to my ear but only turns back on when the other Person ends the call.
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Hey,
my Fairphone shows the same behavior. During nearly all calls the screen stays black and it is not possible to end the call. Till now I made some Mailboxmessages by accident because of this problem. The Proximity sensor of my phone isn’t too dirty or covered by something.
So I think even if the cause is a thin layer of dirt: It is a bug and we should ad it to the list of known bugs. @paulakreuzer: Could you please add it?
P.S. Thanks @AndreasLieser for your advise!
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I’m not convinced it’s a bug yet:
Only 7 people posted here that they had the problem at least once, for some it seems to have been a singular incident and/or gone after a reboot or cleaning the proximity sensor. There is no way (described yet) to reproduce this issue on most FP2s.
But it would be interesting what you hear back from support.
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Hi, Olivier’s here, from Paris.
I have the same problem here. Screen goes black and I can’t hang up, I have to wait my correspondant does it.
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Hello,
Same here. Cannot end call on my own, when mailbox answers I can only remove the battery.
Cheers from Vienna,
Georg
Hi,
I also have the same issue with calls:
I need to wait for the person to hang up, as I cannot see what’s happening.
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Yep, exactly the same issue as described by others - only way I can hang up is by removing the battery!
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Ok then I guess I’m convinced now. 
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Hi,
I know the problem also. I´m not sure that it was everytime, and hadn´t yet the problem that my calling partner hadn´t hanged up the call, but yes, the screen is staying dark untill the call is off.
Hi, I had the same problem, It appeared that it was linked to my new screen protector which was problably blocking the proximity sensor…
I hope it help some of you.
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