There's an OS you might like. It has no UAC, no file permissions, no sudo nor chmod, as it has no multi-user support, no antivirus and no firewall, no protection rings, not even spectre/meltdown mitigations, and most of all - no guard-rails whatsoever: You can patch the kernel directly at runtime and it won't even give you a warn. And yet, it is perfectly safe to run. It's called TempleOS and it achieves such a flawless security by having no networking support whatsoever and barely any support for removable media. If you want a piece a software - you just code it in, manually. You don't have to check the code for backdoors if it's entirely written by you... only for CIA at your actual back door...

What does 'modems in mobile phones' mean? Isn't the whole thing a modem strapped onto a screen? What am I missing?