To open the Voice Command app
From the Home screen, tap the Phone Icon
> the Mic Icon 
. Then say a command.
OR
From the Home screen, tap the Apps icon
(in the QuickTap bar) > the Tools folder 
> Voice Command 
. Then say a command.
From the Home screen, tap the Phone Icon > the Mic Icon .
Then say a command.
OR
From the Home screen, tap the Apps icon (in the QuickTap bar) > the Tools folder > Voice Command . Then say a command.