With the Karma Go you only pay for the amount of bandwidth that you use. You get fast LTE speeds up to 25 Mbps.
The Karma Go is a wireless hotspot that gives you wireless internet wherever you go. It supports up to 8 simultaneous devices. The device is only 2.6" x 2.6" x .47" so you can carry it in your bag. The battery in the hotspot will give you about 5 hours of internet usage. When you do buy data you'll only pay for the amount you use and it carry's over month to month meaning you won't have to pay until you use it.