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Did you try it with a proximity sensors test app or in the engineer mode? Also did you update via OTA or via Oxygen Updater? Try to do a full update again by downloading the full zip from Oxygen Updater then update via local update in System.

Sorry maybe I went a bit fast on this. Maybe not skin only. Actually Sreen-On' proximity sensor works with a combination of sensors (at least gyroscope and speaker). Gyroscope for the position (phones tries to know when your on call position) and speaker to know if an object is near with...

Maybe you will be interested by what I wrote in post #4, #7 and #9 of this following thread : https://forum.xda-developers.com/oneplus-7-pro/themes/proximity-sensor-issue-op7p-t3937147 I'm also trying to figure how proximity sensors work and I'm pretty sure of that : Screen Off : IR proximity...

I tried to with no luck but as I explain in my first message the IR sensor is only used when screen is off (that's why it could help with double tap to wake) But when screen is on another or couple another sensors are used and you can't calibrate them. I think ultrasonic sensor is used when...

Actually I was going to open a new thread in Q&A when I found this one with the same subject and problem. Do you think I need to open a new thread? Is any of you experiencing the same issue as I described in my answer?

I'm experiencing the exact same issue with the caller app. I also tried to make a flip cover to turn screen on or off with a proximity sensor detection app and it didn't work either. I search a little in engineer mode (*#808#) and found that there is multiple proximity sensor, the IR sensor...