LG -P725 User Manual page 36

Getting to know your phone
NOTE: Proximity sensor
When receiving and making calls, the
proximity sensor automatically turns
the backlight off and locks the touch
screen by sensing when the phone is
near your ear. This extends battery life
and prevents you from unintentionally
activating the touch screen during calls.
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WARNING
Placing a heavy object on the phone or
sitting on it can damage the LCD and
touch screen functions. Do not cover
the LCD proximity sensor with protective
film. This could cause the sensor to
malfunction.