Good to see this idea making its way over here, it's still very easy to get out of mobile reception so satellite messaging is a useful backup.
Note that the novelty here is satellite messaging from a normal phone, for those who want satellite messaging right now you can get it easily with a specialised device (e.g. I have an Inreach Mini for backup/emergency comms). Putting it in the device you already have with you is a solid step forward though.