This option helps you to restrict the use of your credit balances to peoples of your choice.

In this case, your outgoing call is barred when the code is activated. Which makes it impossible for you to make any call with your credit balance. This is how to do it.

you dail *33*0000# and send. Now it has been activated, to deactivate you dail #330*0000# and send. To chanfe the code from 0000 to your prefered code you dail .

Please Note When credit barring code is activated, it does not hide your credit balance from view when the appropriate code is activated.