The Sound settings menu lets you control your mobile device's audio, from ringtones and alerts to touch-tones and notifications. To access the sounds settings, from the Home screen, touch Menu
> Settings
> Sound.
To activate Mute, touch and hold the volume down button until you see
in the status bar. To deactivate Mute, touch the volume up button repeatedly to select a volume level.
To adjust your mobile device's vibrate feature:

Adjust the volume settings to suit your needs and your environment.

Note: You can adjust the ringtone volume in normal mode (or the earpiece volume during a call) by using the volume button on the left side of your mobile device.
Ringtones help you identify incoming calls and messages.
Your mobile device provides a variety of ringtones that allow you to customize the way your device will sound when you receive incoming calls or notifications.

The notification area displays icons associated with user notifications such as email messages, missed calls, voicemail, upcoming events, USB connections, or text/MMS messages. You can select the ringtone that plays when your mobile device receives new notifications.

A few additional system settings are not yet covered.