Blackberry HS-655 - Manual (Page 19)

• To turn off mute, press both ends of the volume button simultaneously until
you hear a beep.
Make a call using a voice command
Verify that your BlackBerry® device uses BlackBerry Device Software Version 4.2 or
later and that your device supports voice dialing.
1. Hold the call control button.
2. Say the voice command.
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