CradlePoint has introduced a new modem, the MC400-600M-C-AT. This modem works with ATTs First Net Band 14 along with all of the other ATT Bands. The download/upload speed is 600Mbps/150Mbps.
Although ATT has not fully built out the First Net Network, the modem functions with the 'FirstNet SIM' to give priority routing to those devices with a First Net Data Plan. One cannot just get a First Net Data Plan, the person/organization must be qualified before receiving the plan. In order to use Band 14, you must have the First Net SIM and the First Net modem. If you choose to put the First Net SIM into a 600M modem, you will get priority routing at the tower, but you will not connect to band 14.
CradlePoint also introduced 2 'bundles' for the Mobile Market Segment. One bundle is for the IBR900-600M router. It includes the router, an extensibility dock and the MC400-600M-C-AT modem. Antennas and any power supplies are additional. The second bundle is for the IBR1700-600M router. It includes the router and the MC400-600M-C-AT modem. Again, antennas and any power supplies are additional.
Verizon has a competing offering. It uses Band 13, which is currently available nationwide. Verizon's solution uses software priority routing at the tower. Of course you need a Qualified First Responder SIM.
Information on how to qualify for all carriers is available at https://www.dhs.gov/requesting-wps.
Verizon's solution relies on priority and pre-emption. Any user with a higher priority will preempt any lower priority users and get access to the tower.