8. Back key
redisplays the previous screen or clears
entries.
9. Power/End key
ends a call or switches the
device off and on. Press and hold for two seconds to
turn toggle the volume mode (Mute, Vibrate/Mute, and
volume on) or Airplane mode states, turn the device on
or off, or Restart.
10. Front Facing Camera
allows you to take pictures while
facing the screen and allows you to video conference.
11. Headset jack
allows you to connect a hands-free
headset so you can listen to music.
12. Proximity Sensor
detects how close an object is to the
surface of the screen. This is typically used to detect
when your face is pressed up against the screen, such
as during a phone call.
•
While talking on the phone, the sensor detects talk activity and
locks the keypad to prevent accidental key presses.
13. Light Sensor
lets you use the ambient light level to
adjust the screen brightness/contrast. This sensor
decreases screen brightness in dim light.
•
In a bright light condition (outdoors), the sensors cause the
device to increase the brightness and contrast for better
viewing.
•
In dim light conditions, the device increases the screen
brightness to compensate.
14. Receiver
allows you to hear the other caller and the
different ring tones or sounds offered by your phone.
29