1. Simple Definition Call Barring is a network-level feature that allows you to prevent specific types of outgoing or incoming calls on your phone. Think of it as a "parental lock" or "restriction filter" for calls.
Unlike Do Not Disturb (which silences notifications), Call Barring actually blocks the call from connecting — the caller typically hears a busy tone or a message saying calls are not allowed. You can usually bar (block) these categories independently: call barring means