1. While on an active call, press the Volume keys to adjust the call volume up or down.
   
2. Tap Speaker to enable or disable Speakerphone.
   
3. Tap Mute to mute and unmute the call.
   
4. Tap Headset to enable or disable a paired Bluetooth headset.
   
5. Tap Keypad to access the keypad.
   
6. Tap Hide to hide the keypad.
   
7. Tap Add call to start another call.
   
8. Key in the desired phone number, then tap the Call symbol. Your other call will be put on hold.
   
9. Tap End call to end the call.
   
10. To put a call on hold, tap Hold.
    
11. Tap the Menu key to access additional options.
    
12. Tap Noise reduction off to disable noise reduction.
    
13. Tap End call to end the current call.
    
14. Tap the Home key to access the home screen during a call.
    
15. To return to an active call, swipe down from the top of the screen.
    
16. Tap the Call symbol to return to the active call.