Several functions are associated with On/Off:

Tap On/Off to turn your mobile phone on or off.

Tap On/Off to turn on the screen lock.

Tap and hold On/Off to access flight mode.

Several functions are associated with the Volume key:

Tap the upper or lower part of the Volume key to adjust the ring volume.

Tap the upper or lower part of the Volume key during a call to adjust the volume.

Tap the upper or lower part of the Volume key to silence the incoming call alert.

Connect the charger or data cable to the phone phone socket and to a power point or your computer's USB port.

Connect the headset to the headset socket.

Point the camera lens at the back of your phone at the required object to take a picture or record a video clip.

Point the camera lens at the front of your phone at the required object to take a picture or record a video clip.