Would be nice to have secure SoCs in phones that cut costs with regards to camera and screen, but there is not a market for it I guess because people think they don’t care about security. Android is Linux of course since the Android kernel is a Linux kernel. I’m aware you are probablly referring to using traditional Linux OSes that are typically used on desktops on mobile phones. That would, however, be a significant regression for security. Android and iOS are both modern mobile OSes with an in-depth security model which includes a mandatory app sandbox with a sane permission model. This is not present on traditional desktop OSes. This is not meant to diss on those OSes, they are just children of their time, they were created much earlier, security practices have evolved. I can see why it would be a fun experience though to tinker with, it would just not be a secure experience and it’s unlikely to get there because the improvements in traditional Linux distros go much slower than they go on Android and Android is already massively ahead.