What mobile Wi-Fi hotspot should I buy?

Episode 1192 (50:30)

Emily from Orange County, CA

Emily is thinking about buying a portable Wi-Fi hotspot so that they will have the ability to connect to the Internet with her iPad. Leo says that's a good idea. Are the independent carriers any good? Leo says that there aren't any independent carriers, really. They're just reselling coverage from the big guys (called MVNO) and she'll want to be sure she checks out the coverage maps for the carrier they're reselling. Is Karma good? Leo says that Karma is a Kickstarter campaign that would let her pay as she goes. They're a reseller of Sprint's network. Are they secure? Leo says yes, it's encrypted.