How To Remove International Call Barring - O2 May 2026

If the generic codes fail, O2 uses a specific "Network Service Code" for International calls. Try: ##21*[Password]# (Send) – Note: 21 diverts all calls; for barring specifically, you need 331 .

Call barring is controlled by specific codes. Here is the cheat sheet for international outgoing calls (code 10 or 1 depending on the handset, but typically 10 for all international except home country). how to remove international call barring - o2

If you have enabled, the call barring logic changes. Your call routes through an IPSec tunnel to O2’s core network. If your account has International Barring active, the WiFi Calling server (the TAS - Telephony Application Server) drops the call before it ever hits the international gateway. If the generic codes fail, O2 uses a

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. Here is the cheat sheet for international outgoing

To check the current status of your International Outgoing Barring: *#33*# (Send)