I'm on T-mobile carrier. The method we use to turn off call barring is to open the phone app dialer and type in a code.
To cancel call barring on all incoming calls we call #261#. To cancel call barring on all outgoing calls we call #34 code * pin # and wait for the confirmation message.
The dialing codes are probably different between carriers. You might try calling your carrier tech support and have them turn it off or explain how you can turn it off.