I think its not an app its a spam I looked it and tried to read its situation but did not find any issue its beyond my knowledge I thinks its not an app but I will guide you about it after some research.
Same issue o2 claim they can't do nothing about it. Samsung support can't do nothing they say contact o2. Can't delete the app. So very very frustrating. I have never owned an iPhone nor a blackberry so can't use that option but then why should I need to ? Come on Samsung your loading this software tomorrow phones get a grip why can't I add my number to my sim on my s20
i got a SIM card from 'Blau' which just like O2 belongs to Telefonica,
and somewhere in 2012 my O2 stopped working within a radius of some 20km of my home 🤦♂️ O2 said it works... then i switched to Blau, and now i have yet another O2 number, which works but for the Blau it doesn't. So for the new SIM it shows number but for the old one doesn't 🤔 this is my conclusion.