I currently have a MiFi 2200 Mobile Hotspot for the $59.99 5GB plan. I saw that they offered 10GB for $80 and wanted to switch but it was under a different plan. What exactly is the difference. I was under the impression that I had a "Mobile Hotspot" because that's what the device I'm using is called. So why am I under the 3g usb modem plan? Would I be able to switch over to the 10GB plan with my current device? Thank you! 