Call barring settings can be useful in various situations:
Most networks require a 4-digit password to activate/deactivate barring. The default is almost always 1234 or 0000 . If these do not work, you must contact your carrier to reset it. call barring settings
This stops calls from leaving your phone. Call barring settings can be useful in various
3GPP TS 22.088 (Call Barring supplementary services) call barring settings