I have the s20 plus and am having the same issue every time I make or receive a phone call. I have checked the sensor using *#77692# and the sensor works great but when making calls it doesn't activate at all. Am tired of the flashlight turning on or other settings being turned off. One time my phone was muted and I didn't catch it for a while. Ended up missing a call I was waiting for. About to take the phone back. Spent too much time trying to figure this out!
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