I just came across a post on ycombinator, and it seemed worthy of adding the 
information to this thread: 

"If I were configuring a smartphone today, I'd use @DanielMicay's @GrapheneOS 
as the base operating system." 

source: 
https://mobile.twitter.com/Snowden/status/1175430722733129729

Bill



On Saturday 30 November 2019 01:06:49 Robert Peters wrote:
> Thanks for all the replies - there are several things to try out.  I
> want to get away from relying so much on Google, and that will
> probably include getting a non-Gmail address, and maybe using local
> mail storage such as Kmail...
> Robert
>
> On Fri, 29 Nov 2019 at 12:51, Robert Peters <robertpeters9@...> wrote:
> > HI,
> > Does anyone recommend a Linux-based system that can be installed on a
> > smartphone, to replace the Google Android system?
> > Robert
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail:
> trinity-users-unsubscribe@... For additional
> commands, e-mail: trinity-users-help@... Read list
> messages on the web archive: http://trinity-users.pearsoncomputing.net/
> Please remember not to top-post:
> http://trinity.pearsoncomputing.net/mailing_lists/#top-posting