It is not as good as a decentralized system, and even though the server is open source, it isn’t self hostable (technically in an intranet you could but not easily)
But the signal foundation is a non profit with external audits and a proven track record with law enforced requesting data and getting basically nothing (If i remember correctly they only have your user to phone number relation and the last time you were online)
So although it is imperfect, it is an amazing solution that is almost the only 1:1 competitor to whatsapp/messenger/imessage that is privacy respecting, so I am very grateful for it’s existence.
Ollama + open webui + tailscale/netbird
Open webui provides a fully functional docker with ollama, so just find the section that applies to you (amd, nvidia, etc) https://github.com/open-webui/open-webui?tab=readme-ov-file#quick-start-with-docker-
And on that host install netbird or Tailscale, install the same on your phone, in tailscale you need to enable magicdns but in netbird I think it provides dns by default.
Once the docker is running and both your server and phone are connected to the vpn (netbird or tailscale) you just type the dns of your server in your phone’s browser (in netbird it would be “yourserver.netbird.cloud” and in tailscale it would be “yourserver.yourtsnet.ts.net”)
Checkout networkchuck on youtube as he has a lot of simple tutorials.