When I call someone I can not end the conversation . I have to wait that the other person ends the call otherwise the screen does not work, or if I call someone I have to wait until his mailbox finished the conversation I cannot finished the call before…
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Hello,
I’ve the same issue. I check my proximity sensor and all seems to be good.
In my case it seems to be an software bug. What I can do ???
I’m starting my new business. It’s very important to trust in his device.
Please, do something. I cannot continue with these kind of bugs.
Hello
Same problem … (I got my Fairphone in February - I am in France)
can we have an official response Fairphone on what to do?
thank you
bruno
Not that you need much more confirmation, but I am having the same issue. It makes things really awkward when calling lines that require me to press a key for an option (my voicemail does this). It didn’t happen at first and the solutions offered above have not helped.
Hello
I have the problem with the proximity sensor too… I will try to clean it. But, I have a second problem which bothers me already for a while.
if my screen was in standyby and I try to reactivate, this does not work (the problem hasn’t appeared regulary but multiple times). I have to remove the battery and then, my FP2 works fine again until the next time. I tried to clean the proximity sensor here as well, but that didn’t help.
maybe, there are other users with the same problem… thank you for your help!
This could be the same as is discussed here:
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Hi
I had the same problem. Removing the plastic layer solved it ! However, I didn’t even know what a proximity sensor is (its my fist “smart-phone”), nor that there was a plastic layer on the display… 
My phone was fine in the beginning & this problem popped up just a few days ago.
Removing the screen and blowing onto the sensor and also wiping the sensor window in the screen assembly from the inside (I used a Q-tip [edit: for the window! – not the sensor! ;)]) DID resolve it!
By the way: there was no visible dirt/dust on either of these parts. the phone seemed super clean inside. Still, I am somewhat worried that this will reappear since apparently the sensor got dirty over time. Will report back in case the issue comes back 
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@wolferl I do have the same problem rather randomly and the power button doesn’t work in those instances. Only right after the other side hung up the screen will light up again.
This problem is rather strange.
After I could not reactivate my screen during calls, I also opened up my FP2 and cleaned the proximity sensor.
Then it worked again. For two weeks.
Now it works sometimes.
But sometimes after a reboot the app “Sensor test” says “Far” and then “Near” as soon as I cover the proximity sensor. But then it is stuck to near.
As soon as I reboot the device I am able to repeat this step exactly once.
Its the same with phone calls! When I call someone and do not cover the phone with my ear the screen stays on. As soon as I take my phone to my ear and put it back away the screen stays dark.
So is this a software bug or not?
Please Fairphone fix this as soon as possible. This bug is really annoying.
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The black screen / frozen screen-problem on my FP is solved with the hint we saw here already : to dis- and reassamble the Display. as described in https://de.ifixit.com/Device/Fairphone_2.
I am not a consumer-electronics-design and manufacturing specialist, but in my eyes it seems to be too high electrical resistance between the golden contacts on the backside of the display. Probably a problem that happens due to not propper assembling or not propper designed contact material.
Anyway, I hope the simple way to put off and on the display is a one-shot solution and does not need to be repeated periodically.
I have the same problem - after a few weeks of usage sensor started to think that something is near it all the time :/. I will try cleaning it, but tbh after having an iphone for a couple of years I took a phone needing only minimal maintenance for granted, I haven’t expected anything like this at all.
Not necessarily. To me it sounds like there is again some dirt on your proximity sensor - not enough to trigger it by itself, but enough to leave it triggered.
I had this exact issue too. At first it was intermittent starting about 3 weeks after phone arrived, got worse such that after a month it did it ever time I made a call (note: even without the “power button ends calls” option, if you press and hold power button for 10 seconds it resets phone so no need to remove battery). Just removed screen and cleaned with an air duster and working fine now!
However there was dust and lint behind the screen, and noticed the foam surround that is I guess meant to stop fluff and dust getting into phone through the speaker mesh is damaged. This is first time I’ve removed back so assume it’s from factory and contributed to dust ingress that caused this problem?
Yes that could be a reason.
But then this could be a design flaw of the FP2 itself - I really do not want to open my FP2 every two weeks in order to clean it… That would also be bad for the display contacts I think.
Even though I dont think that this will be different with a new phone I am going to write support again (did that exactly 4 weeks ago and never got an answer - yes, I know they currently have a lot to do) and ask for an exchange.
I’ve got news due to this topic: I contacted the support and they advised all the facts that we all found out in this forum before. At last, I checked the function of the proximity sensor with the Sensors-App and yes, it is defective, doesn’t work.
So I applied for a replacement and filled in a request to send it back or to have the proximity sensor repaired. In about 48 hours, there will be an answer. I’ll have to follow the instructions in the next emails.
Keep you posted. I’m glad having found a solution for my “black screen” phone 
I have the same problem. My screen does often not turn back on after calls, especially when the other person does not hang up. Recently this was a big problem when my bank called me for a pin that had to entered via keyboard. Also sometimes the touch screen freezes in other contexts (with light on). Every time, I can only take the battery out and fiddle the shell back on. So far, I cannot reccomend the fairphone to the many people who are curious about my phone choice.