1. While on an active call, press the Volume keys to adjust the call volume.
   
2. Tap Speaker to put the call into speakerphone mode.
   
3. Tap Mute to mute the call.
   
4. Tap Bluetooth to call through a headset or other Bluetooth device.
   
5. Tap Dialpad to display the keypad.
   
6. Tap Hide to hide the keypad.
   
7. Tap Contacts to add a person to the call.
   
8. Tap Hold to place the call on hold.
   
9. Tap the Menu key to see more call options.
   
10. Tap Noise suppression to reduce background noise.
    
11. Tap Voice enhancement for extra clarity on the call.
    
12. Tap End to end the call.