All major players like AT&T, T-Mobile, and Verizon are closing in on satellites for coverage.
AT&T has partnered with AST SpaceMobile (service should start becoming available in July/August this year)
T-Mobile has partnered with SpaceX (Texting available in 2024, voice and data in 2025)
Verizon looks to be joining AT&T with AST SpaceMobile.
AT&T is getting close to offering subscribers the capability to transform their regular phones into legit satellite devices.
www.engadget.com
I wouldn't spend a ton of money on any satellite messenger right now. Just buy the one that's on sale. I'm guessing most third party units like inReach or Zoleo will start to become obsolete within the next year or two.