Dell XCD35 Smartphone - Manual (Page 82)

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The silent icon will appear in the status bar.
Switching to Vibration Mode
Select the Phone vibrate check box from Sound & display
settings.
If the phone is already in silent mode, the vibration icon
will appear in the status bar.
Adjusting Ringer Volume
If you want to set the ringer volume, make sure your phone
is not in silent mode.
1. Select Ringer volume from Sound & display settings.
2. Adjust the ringer volume and tap OK to save.