AT&T has a business only truly unlimited data plan for hotspots that I ended up getting by actually going into a store and signing up, they don't advertise it at all and at the time, it was the only truly unlimited data plan I could find. It was a lifesaver as someone who sits on Zoom calls for hours each day while in a campervan.

That said, I upgraded to the NETGEAR Nighthawk M6 Pro 5G hotspot and it is a piece of shit that overheats and gets poor performance all the time.