I need an unlimited cell internet service

AT&T’s 4G LTE is faster then my shitty Comcast connection. But we don’t have unlimited data, so I can’t use it for my main internet. Cricket use to have a broadband service, until AT&T bought them.

Does Sprint have anything?

No competition. Comcast is the only available internet. Unless you have around 300 bucks to spend a month, then you can get 50 GB of data from U.S. Cellular. 50 GB wouldn’t be enough.