Not sure Jolla deserves to be trusted, you'd be much better off with GrapheneOS. In any case, try out SimpleX for a messenger. You can also take a look at https://xn--gckvb8fzb.com/an-overview-of-privacy-focused-dec...

Thanks for SimpleX it looks like a great solution for a longstanding problem.

Why would you not trust Jolla? It was born from Nokia employees. GrapheneOS is a great alternative. Still Android though.