Qualcomm and Ericsson has announced that their technology has passed an important milestone in the roll-out of 5G across a country the size of the US on the same band. This 600-megahertz (MHz) frequency, one of the lowest to be associated with the new data standard, is also in use at T-Mobile to establish its own next-gen network.
https://www.notebookcheck.net/Qualcomm-Ericsson-announce-world-s-first-successful-data-call-on-the-band-intended-for-US-wide-5G.427292.0.html
Well we all know that a lower frequency directly translates to lower bandwidths, 600MHz is what...AM territory? I didn't realize the frequency could vary as much a magnitude and still be fundamentally compatible with the multi-GHz 5Gs.