Irihapeti:

 

It's a Motorola G4 Play, running postmarketOS these days. Is there a simple test I can to do check this?

 

If it does become a cellular paperweight, I can still use it as a media player and a wireless access point.

 

Of course there's a simple test: set it on 4G only and try sending a txt! Which it does successfully. My brain must be out to lunch that I didn't think of that sooner. 🙄