How secure and private is VOIP for only at Home? For example Calls with VOIP Provider for Smartphone is often not recommended, because it is not private. But is there really a difference between Home VOIP Setup vs Smartphone VOIP? I did for example read, that if someone has a VOIP Number in the Smartphone, that it connects/pings still to cellular Towers and I don't like that. That is why I removed my Sim-Card already but if Home VOIP still pings/connects to cellular Towers, then, I would avoid that too. And is there a better way to make private and secure calls? (Not Messaging App Calls - I mean normal calls)