Here the same, when the other person doesn´t take the phone, I have to put out the battery, and that is really annoying. I now have that with the power button, but that isn´t a solution.
Is it already reported to an official bug?
Hi there,
same problem here. Phone was working good for couple of days and just today the proximity sensor seems to fail.
Any time i make or receive a call (more precise: as i hit the button to answer or start the call)- the screen turns black and could not be reactivated until the other side hangs up or i remove the battery.
Reboot didn’t change anything.
I could solve my problem by opening my fairphone 2. I removed some dust between the proximity sensor (in the upper left corner) and the display with a vacuum cleaner (with the lowest level…).
No luck for me there. App ‘Sensors test’ (and a phone-call) still say “covered” or “near” (0) after disassembly and thorough cleaning.
Now same Problem here. Sensor is completely clear.
AndroSensor App says Proximity: 0(0.1mA) 0,0 in and it’s not moving.
Thank you, I was looking for an app to test the sensor! This one looks good and does not need any strange rights…
I have got the same result as you, it always says “near”.
ok. After removing the Display and cleaning the Sensor, it works again.
No Workarround for every day.
After 18 hours, Problem is back.
Fixed after cleaning again…
Hey. My phone here in England has had the same problem. One accidental call in the middle of the night I couldn’t cancel to someone and one annoyingly long voicemail when I tried to give someone a missed call to give then my number
The power button is at least better than taking the battery out
I have the same problem. Screen goes black as soon as the call is started, even if the full screen is exposed and never returns until the line is closed.
Where is the proximity sensor?
I have a FP2 from December, and have the same problem, Sensor readout gives also no changes
when running and moving to ear or with hand. The switch solution seems to be necessary 
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I had this problem today. I held the power button and the reboot menu came up and the screen came on. I cancelled the reboot and ended the call.
I have been reporting identical behaviour - screen going black when calls start, not being able to get to screen buttons unless the call is hung up on remote end, etc - but had been reporting it in ‘contact us’ emails, not here on the forum. Adding my observations now too.
I have an FP2. It will give me back the in-call screen if I reboot it and don’t go anywhere near the screen. If I am calling any business with a customer service line, that needs keypad input to make selections I have to plan ahead. 1: Turn off, thoroughly clean and reboot the phone. 2: Place my call and not hold phone up to face or obstruct the proximity sensor. - Only then can I select the keypad and work the call.
3: Other times, when calling humans, I use the ‘power button hangs up call’ option in Settings -> Accessibility, as other have noted, and just get by on not having access to my screen during a call. But I agree with the opinions that a 500+Euro phone needs a fix for this - it really IS a deal-breaker problem…
(no screen protector & film from shipping removed)
thanks 
– updated : see other posts, but open your FP2 (go on, no tools needed) remove the screen assembly (I was nervous at this step but press on…) and see that the sensor is clean inside - mine was all dusty. I cleaned it out and FIXED IT 
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Same problem here. I had to get out of voicemail by removing the battery before I found out about the option of using the power button for disconnecting a call.
I can confirm this on my phone: after reboot the sensor says ‘far’. But after approaching the sensor with my finger, the reading switches to ‘near’ and stays that way.
I had the same problem. Just took off the screen, and fortunately I saw some dust on the sensor. Since I took it away it works well!
Same problem here…
Th screen turns black when making a call and wakes up after the other side finished it. The sensor is fine and works in any other application. I wrote the support. So let’s see if they can solve the problem.
Same problem for me, have to use the camera button to wake the phone up again.
i.e. Make call - screen goes black - screen stays black until the call is hung up by the other party.
I also have this issue. I wrote about it in the related thread:
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