If you want a Linux distro running on a mobile phone with good build quality and decent specs there is Sailfish OS: https://shop.jolla.com/ https://shop.jolla.

If you want a Linux distro running on a mobile phone with good build quality and decent specs there is Sailfish OS: https://shop.jolla.com/ https://shop.jolla.com/ It unfortunately not fully open source, but other than that its a normal Linux distro (Qt, DBus, systemd, rpm, Python, etc.). I have been running it on my primary device for years so I would say it is useable. ;-)