LG Optimus L3 II Guide De L'utilisateur page 238

Getting to know your phone
Phone overview
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
to your ear. This extends battery life and prevents you from unintentionally
activating the Touch screen during calls.
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.
18
Earpiece
Power/Lock key
Switch your phone on/off by pressing and holding this key
•
Short press to lock/unlock the screen
•
Proximity Sensor
Back key
Return to the previous screen. Exit an app after using it.
•
Home key
Return to the Home screen from any screen.
•
Menu key
Check what options are available.
•
Go to Google Search™ by touching and holding this key.
•