Replace "PASSWORD" with your carrier-provided barring PIN (often 0000 or 1234 by default).
Useful when traveling; it blocks all international calls but allows you to call back to your home country. Incoming Call Barring: call barring means
By barring international or premium-rate calls, users can avoid massive unexpected charges. call barring means
iPhones rely heavily on carrier codes or settings within the carrier settings. Some carriers allow you to manage this via the Settings > Phone menu, while others require you to dial specific MMI codes (like *33*PIN# to activate barring) provided by your network provider. call barring means