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Motion sensor while on a call?

Ok so i just discovered somehthing pretty cool. You know when your on a call the screen is black, and then when you move it from your ear the screen turns on? Well i thought the screen was triggered by accelerometer movement. Its not. Theres a motion sensor right below the front speaker. I tested by being on a call, then i pulled the fone away from my ear and saw the screen turned off, then i waved my finger over the sensor and the screen would turn on and off. Or does everyone already know this?..lol Try it, its pretty cool.
 
They've been around for a little while. Since the early touch screens and people started realizing the problem. It's basically so you don't hang up on someone with your ear.
 
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