Opticon H-19B 2D Manual page 75

Select On, Vibrate or Off to quickly change both the ringer and system volume and settings.
To adjust the earpiece volume during a call, press the VOLUME control on the phone side
panel. Adjusting the volume at any other time can affect the ring and notification and MP
sound levels.
Blocking Incoming or Outgoing Calls
You will not be able to receive or make calls according to the options you choose.
1. Tap > Settings > Phone > Services tab.
. Tap Call Barring > Get Settings.