1. While on a call, press the Volume keys to adjust the volume level.
   
2. To enable or disable speakerphone, tap Speaker.
   
3. To enable or disable mute, tap Mute.
   
4. To access the keypad, tap Keypad.
   
5. To hide the keypad, tap the keypad again.
   
6. To begin a 3-way call, tap the Add call icon.
   
7. To hang up, tap End call.
   
8. To access the home screen while on a call, press the Home key.
   
9. To return to the active call, tap the Phone icon.
   
10. Tap Return to call in progress.