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press the Volume Keys to adjust ringtone volume 
(or the earpiece volume during a call).   
Enabling Silent or Vibration   
You can set the phone to the silent or vibration 
mode by using one of the following methods. 
  Press and hold the Power Key and then touch 
  to enable the silent mode, touch    to 
enable the vibration mode, or touch    to 
disable the silent mode. 
  Touch the    > Settings > Sound > Silent 
mode, and touch Off, Vibrate or Mute. 
Opening/Closing the Notification 
Panel 
Notifications report the arrival of new messages, 
calendar events, and alarms, as well as ongoing 
events, such as when you are playing music. 
You can open the notification panel to view the 
details of notifications. 
  To open the notification panel, swipe your 
finger down from the top of the screen. 
  To close the notification panel, swipe your 
finger up from the bottom of the screen or 
touch the Back Key.