ZTE BLADE - Manual (Page 86)

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Set the default notification sound
1. Select Notification Sound from Sound settings.
2. Scroll the ringtone list and select one to set as the default
notification ringtone.
3. Tap OK to save.
Switch your phone to silent mode
1. Select the Silent mode check box from Sound settings.
2. You can also switch to silent mode by holding Volume
Key (Down) or, when the screen is locked, by dragging
the Sound off bar to the left, as shown below.
By default, vibration is enabled in silent mode, and
appears in the status bar. If vibration is disabled, the silent
icon
will appear in the status bar.