K8y Thank you, so does this mean the satellite feature is not included in Graphene OS?
My understanding is that the feature is not part of AOSP, i.e., it depends on a proprietary Google app. I don't think the GrapheneOS project has yet looked into what it would take to get that app running, and it's possible that it can't be done. For example, if the app uses the "Integrity" (attestation) system to check that the app is running on Google's OS, it won't run on GrapheneOS.
I have read that the system is "free" for Pixel 9 owners for some time, which really means that Google is paying the satellite company. So Google might well want to restrict use of the service to devices signed in to their infrastructure and running their OS.
It is possible that eventually this sort of thing becomes common enough (and cheap enough) that an open implementation will become available, and it's also possible that the GrapheneOS team might get Google's app to run. But I am unaware of any plans or even efforts along those lines.