Adjust the volume
• To increase the volume, press the Volume Up key on the right side of your BlackBerry smartphone.
• To decrease the volume, press the Volume Down key on the right side of your smartphone.
• To mute the volume, press the Mute key on the right side of your smartphone. To turn off mute, press the Mute key
again. If you press the Mute key during a call, your smartphone mutes the call so that you can hear others on the call,
but they can't hear you.
Mute a call,
Improve sound quality for media files,