It’s really an uphill battle to get security privacy and anonymity with your modern mobile cell phone and mobile companies. With mobile devices, it’s more of a best-effort approach to privacy and anonymity. For example, I'm using a secure messaging app like signal but I acknowledge that if I’m using an iPhone, Apple, my network provider, can control my phone if they really want to and that’s the same for all other major operating systems and networks like Android, Windows, BlackBerry etc.
A vssmonitoring.com blog post published on June 21, 2021: https://www.vssmonitoring.com/cell-phone-privacy-issues/