I'm in the uk and have a 5g router, looks like a normal home land-line router but takes a sim card. I pay £20or $27 for truly unlimited high speed Internet on a data only deal. I stream all my TV and movie watching thru it as well as surfing the net, regularly use over a few hundred gb a month with no issue or strangulation of the speed. I also have a battery operated mifi orhotspot device I can take anyplace with me, I just swap the sim card when needed.
Coverage isn't bad and get a decent signal most places I've been, only really struggle when in remote parts of the Scottish Highlands.
The router is 12v so I just cut the plug off it and hard wired it into my camper
I know it's of no use to most of you on this forum being USA based, I just can't belive how much you pay for mobile data. The prices that's been said in this thread are what we're paying 10 yrs ago. Things are normally a lot more expensive here,