1. While connected to a call, press the Volume keys to adjust the call volume.
   
2. Tap the Speaker icon to toggle speakerphone on/off.
   
3. When speakerphone is enabled, the Speaker icon will display in the notification bar.
   
4. Tap the Mute icon to mute/unmute the microphone.
   
5. When the microphone is muted, the Mute icon will display in the notification bar.
   
6. Tap the Keypad icon to show/hide the keypad.
   
7. Tap the Hold icon to place a call on hold.
   
8. Tap the Add call icon to connect to another call.
   
9. Press the Home key to return to the home screen while staying connected to the current call.
   
10. To return to a call in progress, tap the Phone icon.
    
11. Tap Return to call in progress.
    
12. Tap the End call icon to hang up.