"https://en.wikipedia.org/wiki/LineageOS" uses a Linux kernel, but it can also use Android apps.  It's more like an improved version of Android than a GNU/Linux distro customized to work on a phone.  Some of these operating systems are more usable than Android, but I agree that there are still problems with hardwired backdoors in the phone hardware itself.

On Fri, Nov 29, 2019 at 1:55 PM Dr. Nikolaus Klepp <office@klepp.biz> wrote:
Anno domini 2019 Fri, 29 Nov 12:51:10 -0800
 Robert Peters scripsit:
> HI,
> Does anyone recommend a Linux-based system that can be installed on a
> smartphone, to replace the Google Android system?

LinageOS?

But whatever you do, it won't make the phone more usable or more "secure", as there are hardwired backdoors.

Nik



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