It has a proximity sensor. There is a teardown video in YouTube, and under the first corny he has uploaded the photo of proximity sensor.
For me it was fixed like 3 updates ago. I even rememer reading update notes and it said: fixed promiximity sensor issues. No idea what others are about. If proximity sensor was broken, do you really think there would be 4 comments here?Since a lot of ousers are getting that problem, I wonder if it is finally fixed? I am seriously thinking of buying this device, but this open topic still keeps me waiting because this wuld make the device useless. So are there any details known about the reason this happens? Is it a hardware or software issue? Any information from Xiaomi so far?
This is a hardware issue because the sensor is triggered not only from the front (like a normal infrared proximity sensor) but also from the back and top (you can check this by running the sensor test). Thus, the developers bypassed the problem when the phone is on the table, and the sensor is triggered on the table surface and the like (otherwise the screen will turn off due to the sensor). They decided to simply turn off the sensor when the phone is tilted about 45 degrees from the ground. A very stupid idea. It is clear that the phone was not particularly tested before the launch, or the developers have little understanding of how people use the phone. The phone cannot be used while lying or on the move. They probably think that people talk on the phone exclusively standing perpendicular to the ground and not moving. In short, there is no hope of fixing this problem. The most they can do is increase the angle at which the proximity sensor turns off. Bad hardware design.
Check this thread on Mi note 10 lite proximity sensor issues!!! https://c.mi.com/thread-3130757-1-0.html?t=1600791689346
Quoting comment #217:
You can check that proximity sensor isn't working correctly by dialing *#*#6484#*#* and selecting option 14
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For me it works most of the time in vertical position.
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I prepared for those who do not fully understand the sensor problem
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