To check the current status of your International Outgoing Barring: *#33*# (Send)
To remove it, you aren't just changing a toggle; you are explicitly assuming financial liability. Most people don't know that O2 adheres to the GSMA (GSM Association) standard for call barring. You don't need an app or a web portal; you need the SIM application toolkit hidden in your dialer. how to remove international call barring - o2
O2 runs a dynamic credit check. If your billing address is new or you have missed a payment, the system auto-applies "Barring Level 2" (International). You cannot remove this yourself. You must pay your bill or call Customer Service (202 from an O2 phone). To check the current status of your International