1. While on an active call, use the Volume keys to adjust the in-call volume.
   
2. Tap Speaker to enable and disable speakerphone.
   
3. While speakerphone is enabled, the Speakerphone icon will be displayed in the notifications bar.
   
4. Tap Mute to mute and un-mute the call.
   
5. While muting is enabled, the Mute icon will be displayed in the notifications bar.
   
6. Tap Headset to enable and disable the use of a paired Bluetooth headset.
   Note: Bluetooth must be enabled and a device must be paired for this feature.
   
7. Tap Keypad to access the keypad.
   
8. Tap End call to end the call.