B a s i c a n d c a l l f u n c t i o n s
3. Basic and call functions
■Lock keys
Slide the keylock switch to lock and unlock the headset buttons.
When locked, all button presses are ignored and 
appears on the display. Press the call or end/stop button to answer or reject incoming calls even if the buttons are locked.
■Adjust earpiece volume
Press the volume up and volume down buttons to adjust the earpiece volume. If you press and hold either button, the volume continues to increase or decrease until you release the button.
The current volume level appears on the display.
■Received messages
When you receive SMS or MMS messages, the following icons appear near the call button:
indicates you have at least one unread SMS message that you can view on the phone.
indicates you have at least one unread MMS message that you can view on the phone.
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