orange/yellow dot in status bar - who is listening to my calls

I am using iOS 14.2. On a call yesterday, I noticed the yellow or orange dot above the signal strength bars. An article said it means someone is listening to my calls and Control Center would tell me which App was doing it. I went through settings, and to control center, and could not find it. Can someone please tell me how do I find this out? It does me no good to know that someone is snooping if I can't prevent it. thank you. PAF