Note that, although we don't make this super clear, our generic "SMS module" is actually extremely specific to a few types of SMS modems from Airlink:
It is not a general purpose "send alarm notifications over SMS using any provider" option.
We also have a Twilio based SMS module, and there's going to be a Twilio based voice option first-party in 8.3.
But any integration with Starlink as a modem is not going to be possible first party. The best experience would have be with a custom module ex working from our notification profile example module, but you could achieve one way notification relatively easily with a scripted pipeline block if Starlink provides you with an API that you can call from scripting.