Pressing these keys can enter the digits 0 to 9 (in idle mode or in number- inputting mode) or some associated characters (text editing mode) and perform associated functions (in a list).
2.1.9 Volume side key
You can adjust the earpiece volume using side keys directly during a call or in idle mode 
except vibrate only mode 
.
2.2 Idle mode screen
2.2.1 Screen indicators and icons
Depending on your wireless service provider, some or all of the following indicators and icons may be displayed on your phone's screen.
When the phone is powered on, the following icons may be displayed: 2.2.1.1Battery level indicator 
The Battery Level Indicator shows the representative charge held by the phone's battery. Bar segments within the Battery Level Indicator show the level of charge held. All bars visible indicate a full charge. If only one or two bars are visible, it means the battery is low.
2.2.1.2 New message 
The icon is displayed on your screen when a new message arrives. The new 9