1. While on a call, press the Volume keys to adjust the volume level.
   
2. To enable or disable speakerphone, tap Speaker.
   
3. When Speakerphone is enabled, an icon will appear.
   
4. To enable or disable mute, tap Mute.
   
5. When Mute is enabled, an icon will appear.
   
6. To enable or disable a Bluetooth headset, tap Bluetooth.
   
7. To access the keypad, tap Keypad.
   
8. To hide the keypad, tap Hide.
   
9. Tap the Menu icon for additional options.
   
10. To begin a 3-way call, tap Add call.
    
11. To hang up, tap End call.
    
12. To access the device while on a call, press the Home key.
    
13. To return to the active call, tap the Notifications bar.