You forgot the link

Ah man, they beat Thought Emporium’s Torment Nexus to the punch!

One thing I didn’t mention is that VoLTE requirements will make this harder than it used to be. I’m not sure there are any usb modems that would work with mod_gsmopen that support it. I found some cheapish GSM<>VoIP gateway on AliExpress but the only support GSM, so they are useless in North America.

It’s doable by hosting your own Asterisk or FreeSWITCH. You can accomplish this in FreeSWITCH using a GSM/LTE modem and the mod_gsmopen module. FreeSWITCH can also be used as an IMS provider for VoLTE, but that’s way too involved and probably not attainable for a home gamer. In Asterisk (or also an option for FreeSWITCH) I believe you will need an GSM to SIP Gateway which is going to be a bigger investment in terms of hardware as they tend to be rather specialized.

I know you said you’d pefer the physical sim option so you can pay chash, which is valid. But also have a look at https://jmp.chat/ service, they are good people. They provide a SMS enabled gateway you can connect to with XMPP and specifically support multiple recipients.

Yeah that do, I remember that the demo was pretty impressive ten fifteen years ago!

And you better inspect and execute a downloaded copy, because a malicious actor can serve a different file for curl/wget than to your browser

Mind you the issue here is that an old Android phone will likely have an outdated kernel. Even if there is a custom ROM for it. Leaving you vulnerable, which isn’t great.

Also https://github.com/acon96/home-llm/blob/90c0edc0907e4567eeca89a6f89b43c0b0b807eb/docs/Setup.md

Home Assistant can absolutely do that. If you are ok with simple intent based phrasing it’ll do it out of the box. If you want complex understanding and reasoning you’ll have to run a local LLM, like Llama, on top of it

Tailscale is a VPN.