Proximity Sensor is a hardware level sensor to detect nearby proximity within the handset.

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Disable automatic screen turn-off during call

I use Gingerbread. My Android phone has feature, that turns off display during call when I put the phone to my ear. However, the sensor is probably over-sensitive in my device, so it often turns off ...
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Whats the use case of proximity sensor?

Can anyone explain me whats the use case of proximity sensor. What if my phone's approximity sensor stop working or get damaged. What are the problems will I face. PS: I am just curious to know.
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Is there a device that will keep me from losing my Android phone?

Recently I lost my phone and have had to order a replacement. It seems that there should be some sort of device I could use that would sound an alarm when I separate more than, say three meters from ...