Prepare to pony up for 4G LTE service with tethering as part of your plan. Verizon has the widest coverage but they are a pain in the ass. I have T-Mobile and am happy with it. Unlimited minutes, messaging and data with 4.5 GB of tethering and mobile hot spot for $99.00. I’m in a city. Not so good outside of town.
I used one of those little mobile Verizon units belonging to a customer, and the throughput just sucked. Not sure if it was my location at the time (town of about 25,000) or a limitation of the system itself.