Well, I've discovered it also has one on the opposite corner (bottom left and right), AND on the top right corner, so a total of 3 of them. I believe what they are is near Infrared Emitters designed to assist the phone in detecting hand motion, i.e. the wave feature (must use infrared detector rather than the camera which until now I previously believed it used). They are lit dimly when the screen is off, and when the Active display is not active. They go out the moment it detects hand motion and activates the Active Display.
Now, for even more interesting news...
I accidentally forgot to plug in my Turbo the other night after a long day's hard running. It was very low when I went to bed, under 15%. I sat it on the nightstand and fell asleep. In the morning it was unresponsive. SOOO, I plugged it into the charging cable and what did I see??? How about a Green LED to the left of the front facing camera! Yep, another LED. This was obviously not an infrared emitter since it was green light. Furthermore it was clearly designed to be seen being rather bright although tiny. The red emitters are all rather hard to see except in total darkness, which makes sense since our eyes can't see Infrared.
Now, wonder if that LED is only tied to the battery charging and monitoring circuit. It did eventually go out once the phone reached sufficient charge to power up on its own, so it is in a way similar to the white LED that is commonly referred to when Motorola phones are deep discharged and will not take a charge, as "the white light of death".
Anyway, thought I'd mention it. Anyone else see it?
