Someone shared with me on TS so wanted to share here - more info on message to satellite for iPhone users
https://support.apple.com/en-us/120930
About Messages via satellite on your iPhone - Apple Support
With iPhone 14 or later, you can send iMessages or SMS messages via satellite when you’re off the grid with no cellular and Wi-Fi coverage.
https://support.apple.com/en-us/120930I sent this out as well. Especially good for people to know as I have a feeling the WHs will use the Starlink distribution (and it appears, T-mobile) as a way to turn off the old system.