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Is proximity sensor hardware or software?

I currently have an LG Voyager from Verizon and will be getting the Hero tomorrow. The Voyager has a feature that as soon as you make a call, the screen locks. There is also a setting to keep the screen unlocked for voicemail and toll free numbers because it assumes you'll need it. Is there an option/app like this for the Hero?
 
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Search "Proximity Sensor"

It's in the market.

It uses the same thing the screen uses to detect brightness (the little dot on the opposite side of the speaker from the LED notification, if that makes sense).

It works good.

I only have problems with it when I use it in a dark room, bc then when you remove the screen from your head the screen stays off. But a simple click of the back button takes it away. ;)
 
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