I use a Verizon device that plugs into a USB port. I love it. Verizon let me rent it for a month to see how I liked it before I had to sign a contract.
5G a month for $50.00 and I feel is worth every penny given travel and the fact that I write it off for business
BTW it does work in Huntsville...I used to travel there a bunch.
It is so nice to be connected when the flight gets canceled!