[maheart]

>The real problem are mobile operating system

There's SailfishOS. It still uses Android kernel+drivers, but above that it's a "real" GNU/Linux system (glibc, systemd, bash, Qt, connman+ofono, zypp/packagekit, Gecko). It's not completely FOSS, but it is usable as a daily driver, and has been for at least 10 years (based on personal experience).