1. While on an active call, press the Volume keys to adjust the call volume.
   
2. While on an active call, tap Speaker to enable speakerphone.
   
3. When speakerphone is active, the Speaker icon will display in the Notification bar.
   
4. Tap Mute to mute your microphone.
   
5. When the microphone is muted, the Mute icon will display in the Notification bar.
   
6. Tap Bluetooth to connect to a Bluetooth headset.
   
7. When Bluetooth is enabled, the Bluetooth icon will display in the Notification bar.
   
8. Tap Add call to make another call.
   
9. Tap Keypad to display the keypad.
   
10. To access other call options, press the Menu key, then select the desired option.
    
11. Press the Home key to return to the home screen while staying connected to the current call.
    
12. To return to the call, swipe down from the Notification bar.
    
13. Tap the Call widget to return to the call.
    
14. To hang up, tap the End call icon.