If you own a Samsung Galaxy S9 on the O2 network and are finding that you cannot make or receive calls, you may have "Call Barring" activated. This feature blocks certain types of calls (outgoing, incoming, or international) for security or cost-control reasons.

Guide for the Samsung Galaxy S9 - Turn call barring on or off

As we have no access to your account we would not know why your international calls are barred nor are we in a position to remove ... community.o2.co.uk Bars & Bolt Ons | Help & Support | O2 Business Bars and Bolt Ons. Bolt Ons are extra packages that can give you more value on your account, from cheaper calls to specific number... O2 UK How to turn call barring on your Samsung Galaxy Tab S9 Ultra ... How to turn call barring on your Samsung Galaxy Tab S9 Ultra 5G on or off * Press the call icon. * Press the menu icon. * Press Se... O2 UK How to turn call barring on your Samsung Galaxy S9+ on or off You can block certain types of calls such as incoming calls when you're abroad. 1 2 3 4 5 6 7 8 9. Step 1 of 9. Step 1 of 9. 1. Fi... O2 UK O2 abroad. Incoming calls - Page 2 - MoneySavingExpert Forum Feb 10, 2006 —

If the above methods don't work, you can contact O2 UK's customer support for assistance:

Sometimes the barring is active on O2’s side due to billing or account settings.