Black screen during a telephone call and unable to stop the call because the screen doesn#t work

[tkos]

That’s a problem with the proximity sensor. The sensor checks if you are holding the phone on your ear and switches off the screen to prevent false touch inputs.
Problem and workaround in this topic:

FP2 Screen can't be reactivated during/after calls - See first post for Workarounds

Solution: Please follow the official troubleshooting tool.

archived text

Besides a badly calibrated sensor the next most common reason for this issue is dust between the proximity sensor and the screen. For more info check <a href="https://forum.fairphone.com/t/fp2-screen-cant-be-reactivated-during-after-calls-see-first-post-for-workarounds/11874/148?u=paulakreuzer">this post</a>. Cleaning tips: Clean the screen of your phone, especially the part where the proximity sensor…