@sarrasine Thanks. I don't need the mmWave here in the hills. It is not economically viable to deploy it in this area. I saw those Netgear devices. Both are pretty expensive, though, and are a bit overkill. I believe a cheap 5G smartphone such as a used, unlocked Samsung A14 could do the same job. I don't need very high speeds at this is just for backup. Verizon throttles the home internet service to about 110 Mbps down / 12 Mbps max and that still works fine as a backup.
I believe Wifi can be used as a WAN in pfSense, both with these Netgear devices and a smartphone. But it is not the preferred method. USB or Ethernet would be better.
A smartphone will only act as a router when tethering, though. Will the Netgear hotspots work in bridge mode, as opposed to router mode ?
I'm interested in a BYOD plan, but probably not an unlimited one due to price constraints. I still would like to know what the terms are, and in particular whether a public IP is offered or not.