1. From any screen, press and hold the Home key.
   
2. Drag your finger up to Google.
   
3. Tap the Microphone icon, or speak the phrase "Ok Google".
   
4. Speak the desired commands.
   Note: For this demonstration, say 'Call [contact name]'.
   
5. To access voice command setting, swipe down from the Notification bar.
   
6. Tap the Settings icon.
   
7. Scroll to, then tap Accounts & sync.
   
8. Tap Google.
   
9. Tap Search.
   
10. Tap Voice.
    
11. Edit settings as desired.