Mine goes fine on 4G and VoLTE as I was saying - and it's a parallel import.
Doesn't support 5G but that doesn't really bother me; coverage on that network is quite limited at the moment, 4G provides enough bandwidth for what I need. I do see a few areas around that are 3G only as well though. Most recently when driving out to Riverhead I was in coverage of a few 3G-only cellsites on the way. I presume (hope?) that these would all be upgraded to 4G before the switchoff date.