1. Press the Volume keys to control the volume of the device.
   
2. Press the Power/lock key to lock or unlock the screen. Press and hold the key to turn the device on or off.
   
3. Press the Voice Command key to use voice commands.
   
4. Press the Camera key to launch the camera.
   
5. Press the Call key to open a list of recent calls.
   
6. Press the Back key to return to the previous screen.
   
7. Press the End key to return to the home screen. Press it during a call to end the call.