The most popular reason for O2 call barring is to avoid "bill shock." By barring international calls or premium rate numbers, you ensure that your monthly bill never exceeds your expected budget. Security and Theft
The utility of O2 Call Barring spans several demographics. For parents, the ability to "bar all outgoing international calls" on a child’s phone prevents bill shock from premium-rate or long-distance dialing. For business travelers, "bar incoming when roaming" is a strategic financial tool; since many networks charge for receiving calls abroad, activating this barring ensures the user only pays for outgoing calls or data, not for unwanted marketing calls from home. o2 call barring
If you have changed your four-digit barring password and forgotten it, you must call O2 (202) to have it reset. The most popular reason for O2 call barring
Blocks incoming calls only when you are outside of the UK to avoid roaming fees. For business travelers, "bar incoming when roaming" is