How To Remove International Call Barring - O2 Site

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.

Here is the deep technical and procedural dive into how to dismantle that barrier. Before we get into the codes, let’s understand the why . O2, like all Mobile Network Operators (MNOs), is terrified of three things: Premium Rate Fraud, SIM Swapping exploits, and Bill Shock. how to remove international call barring - o2

To International Call Barring (All outgoing international calls): #33*[PIN]# (Send) If you have enabled, the call barring logic changes

Remove the O2 barring, but immediately install a VoIP app (Skype, Viber, or Google Voice) and block international calls at the phone level . Go to Settings > Screen Time > Content & Privacy Restrictions > Cellular Changes > Don't Allow. Then, allow only VoIP apps to dial internationally. Here is the deep technical and procedural dive

Wait, what PIN? Unlike your SIM PIN (which unlocks the phone), Call Barring has a . On O2 UK, the default is usually 0000 or 1919 . On O2 Germany (Telefónica), it is often a 4-digit code provided when you bought the SIM. If you enter the wrong code three times, you lock the feature.

International calls are a regulatory minefield. Termination rates (the cost to connect a call in a foreign country) fluctuate. If a malicious actor gains access to your SIM, the first thing they do is dial a premium-rate Caribbean island number to drain your credit. Consequently, O2 often applies a as a default security posture on Pay & Go (prepaid) and even some Pay Monthly accounts.