Several functions are associated with On/Off:
Press and hold On/Off to turn on your device.
Briefly press On/Off to turn on the key lock.
2. The Home key
Press the Home key to return to standby mode.
3. The Volume key
Press the upper or lower part of the Volume key to adjust the ring volume.
4. The Reset key
Insert a sharp-pointed object (such as a paper clip) into the the small hole next to On/Off to restart the device.
Connect the charger or data cable to the socket and to a wall socket or your computer's USB port.
6. Headset socket
Connect the headset to the headset socket.
7. Camera lens at the back of your device
Point the camera lens at the back of your device at the required object to take a picture or record a video clip.
8. Camera lens at the front of your device
Point the camera lens at the front of your device at the required object to take a picture or record a video clip.
9. HDMI socket
Connect a HDMI cable to the HDMI socket and to an external screen to view your pictures or video clips.