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Old 02-01-2010, 02:34 PM
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jcookjr82
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Re: Sceen light goes on and off during calls when touching your face

It's the proximity sensor to the left of the ear speaker. It's so when you're making a call in poor lighting or the dark, you can resume functionalty of the phone without having to press the power button. This is also useful when you are trying to take notes during a call.

Hope this helps!
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