8
To adjust the ringer volume, adjust the voice volume
during a call and adjust media volume.
To connect an earphone so you can listen to music or radio, etc.
Allow you to take pictures while facing the screen.
To hear the voice of the other side when calling.
Switch the phone on or off.
Press and hold to open phone options menu.
Go back to the previous screen;
Close the on-screen keypad, a dialog box, an options menu, or
the notification panel.
Go to home screen;
Press and hold to open a window showing you most recently
used applications.
Switch to recently used applications.
To connect charger or USB data cable for data exchange.
To take photos in low-light conditions.