Am I understanding correctly that the Mini 2 can only text or email to another Inreach? Even with a phone and the app?

I am ready to pull the plug and buy a Mini 2 now that they are on sale. But as I research further, It may not suit my needs. I want to be able to send a message while hiking OR if cell towers go down and satellites are up. Is it true that the recipient must have an Inreach? What if they have a Spot?