Under my previous company I could access from the browser and the app the bars that I wanted to have or that I already had. Anything from premium calls bars to barring incoming calls of various kinds etc. I did not even know how many they are. How can I now know which ones I have activated or not? Only by calling customer services?
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Unfortunately, O2 aren't quite as advanced as Vodafone in that area.
There are various bars you can apply via CS which are mentioned here Guide: Tips to avoid unexpected charges on your bill