I moved your topic here, because it’s the same problem. Have a look a the first post, maybe that helps…
After having read this thread I can add that the problem occurs even if I hold the phone in the hand and not to the ear!
Ending calls by using the powerbutton is a poor solution as is does not allow you to tap numbers to automated answering machines
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Same problem for me. Stuck in the voice message, no way to end the call even when I clean the screen.
Only solution (VERY annoying) : press the power button until the phone reboots.
That + the bluetooth audio issue = a phone that’s not worth the 500+ € I paid, please provide a serious update asap !
Thanks
Nicolas
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Any of the sensor tests I do show the proximity sensor to be working just fine. Could there be another cause for this?
Hi Paul,
I think that if ‘only’ 7 people report it here it will happen for much more people. Not everybody reports it, especially not if already 7 people reported about it. Personally I have the problem very often, which is bugging me very much, but I didn’t report it.
So, yes it certainly is a bug. And if users have difficulty reproducing/explaining it, then I think that is something for the developers to find out. For me as an end user it is a major bug!
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You are responding to a post I made 20 days after this topic was created. That was 2 months ago.
In the meanwhile this topic was in the bug reports category already, but then we decided to move topics that are not confirmed as bugs yet out again.
It is now on the common issues list.
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Well, that might be true, but for the other side as well.
I had this issue once, and after cleaning the sensor from the inside, everything is okay again. 
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Just to reassure some of the more upset people here, that same here, all is working fine now that I’ve cleaned it - even with this protectionfilms24 screen protector. Hope it lasts.
Congratulations to you. The problem remains here and I have no protection film to remove
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@paulakreuzer: Maybe thats interesting for solving this problem in the future:
I have the same problem with my sensor. Cleaning solves the problem every time.
I saw that the seal of the sensor isn’t saved from dust. The seals of the other sensors (on the inside of the display) are higher than the display. Only the Proximitysensor-seal is lower than the display. So dust can come in.
Sorry for my bad english… for better understanding i made some pictures:
Here you can see it best:
For me its a manufactured failure… Changing the Display with one with a correct seal would solve…
Regards,
Jonas
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Jonas, thank you for this helpful insight.
This sounds like the most logical explanation to me and is probably the reason why I have to clean that damn sensor every two weeks…
I will check the same on mine and if it is the same write the Fairphone support again.
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@woka thanks for this information! Nice catch and great pictures! (Obviously not taken by a FP2 ;))
I contacted @Douwe and asked him if it would be possible to make this slight adjustion in the design for future FP2s being produced. Let’s see.
Maybe we could come up with a #hardware:diy solution as well? Maybe a simple rubber-band glued around the proximity sensor window would help.
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Thank you @woka for this insight. Personally I cleaned my sensor once with pressured air and it helped so far but I can’t say for certain that dust is the cause of this issue.
I’ll forward your post and pictures to the Hardware dept. and hope this will help them.
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I hope that Fairphone is able to fix this issue since it really is annoying. Just cleaned the sensor for the fourth time!
And this cannot be the solution to a problem for a phone with a price tag of 500 euro…
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I just got some feedback from Olivier Herbert who is the CTO of Fairphone. He is investigating the matter, but wanted to share this with you:
It’s important to note that the seal is formed by the combination of both the gasket on the display frame (which is flush/slightly recessed) and the light pipe on the top module (which is protruding). The other seals are formed only by one element, hence the need to have it protruding.
I am just adding the same problem. I did clean my sensor, but it didn’t help… I know use the workaround but changing the power button but I’m also quiet disappointed in this functioning.
Annick
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@Douwe: Thank you for your fast acting in this issue.
I dind’t noticed the counterpart of the seal and its a technical explanation for me.
With my curiosity i opened my FP again and had a look on this counterpart.
In my Phone the seal has an inclination, as you hopefully can see on this pictures:
Angle is flat from the bottom
Angle is flat from the top
I don’t want to split hairs (caution: german phrase). I hope this helps Olivier by investigating.
p.s. I would like to make those photos with my phone 
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Ok, i have the same problem. The on/off button trick works when you make a regular phone call. When you call with Whatsapp, this does not work. And if nobody answers your call, you have to get the battery out (annoying). The proximity sensor does not register anything, so i wanted to open up the phone. Unfortunately i cannot slide the screen of the body. On the youtube video it seems very easy, but me and my colleagues did not work this one out. HELP
There are some tips and tricks here: