I have seen what you mean. It doesn't happen all the time but sometimes like when you restart the phone or other unusual times there is a very faint red light. I think it is the proximity sensor? But not sure.
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It's the IR light, same type of near invisible light that's used in night cameras, TV remotes, etc. The IR light on the front of the phone is what helps to detect how close your face is to the phone so it know when to lock the screen so your cheek does not hang up the call.
the 2 sensors before the camera the first one the red light is on what does that mean? even when the screen is not on. its not bright but i can see it
what I've noticed is I only have the few motion sensors, the one were you are in the thread texting and you put phone to your ear and it makes call and only time the light comes on is when in on a texting thread so that must be for the motions, yours must always be on because you have smart stay
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i found a solution )
After i tried sooo many app to disable this sensor light. I found that the solution is to open viber and exit from it ( from settings select exit don:t exit by home button) and try
I have noticed that too. Soon afterwards, I also noticed that the hand gesture for taking screen shots & muting sounds does not work anymore. Also, I downloaded "smart screen off/on lite" just to test the switch. This utilizes the proximity switch to close the screen & worked ok! Hand gestures still not working!