Here is my review of the process, the problems, and the solution.
If the settings menu is inaccessible or returns an error, you can use universal network codes to reset barring status. samsung s9 remove call barring o2
Removing call barring on a Samsung S9 with O2 is a straightforward process that can be done using the Phone app, O2's customer service, or online account manager. By following these steps, users can easily remove call barring and make international calls or use their phone as needed. If you encounter any issues, refer to the troubleshooting tips or contact O2's customer service for assistance. Here is my review of the process, the
This is the standard way to manage call restrictions directly through the Android interface. Open the app. O2's customer service