O2 Call Barring -

Navigate to → Supplementary services (or "Calling accounts" on some devices). Select Call barring and choose Voice calls .

Toggle the specific barring type you want (e.g., "All outgoing calls", "International calls", or "All incoming calls"). o2 call barring

If you are an O2 Business customer, you can manage bars for multiple lines through the portal: "All outgoing calls"

Parents often use call barring on their children’s phones to ensure they aren't calling international numbers or subscribing to expensive SMS services. Troubleshooting Common Issues o2 call barring

Blocks calls to expensive 09 numbers and directory enquiries. How to Set Up O2 Call Barring