1. While on a call, press the Volume keys to adjust in-call volume.
   
2. Tap Mute to mute/unmute the microphone.
   
3. While the microphone is muted, the Mute icon will display in the Notifications bar.
   
4. Tap Speaker to enable/disable speakerphone.
   
5. While speakerphone is enabled, the Speakerphone icon will display in the Notifications bar.
   
6. Tap the Keypad icon to show or hide the keypad.
   
7. Tap the Menu icon for more options.
   
8. Tap Add call to add another call.
   
9. Tap Hold to place a call on hold.
   
10. While a call is on hold, the Hold icon will display in the Notifications bar.
    
11. To take a call off hold, tap the Menu icon.
    
12. Tap Unhold.
    
13. Press the Home key to return to the home screen while staying connected to the current call.
    
14. To return to the call in progress, swipe down from the Notification bar.
    
15. Tap the call notification to return to the call in progress.
    
16. Tap END CALL to hang up.