Once call barring is removed, test it by calling a friend or your own voicemail (222 from your S9). This guide is for the Samsung Galaxy S9 running One UI (Android 9/10). O2 UK settings are correct as of 2025. Always check with O2 if you are unsure about your account status.
If you’re trying to make a call on your Samsung Galaxy S9 and you hear a message saying “calls are barred” or “call barring is on,” you won’t be able to connect until the feature is turned off.
