Clearwire is also pretty limiting in the sense that it only has a third of U.S. cities covered and currently has no plans to expand to more. I bet Karma is negotiations now with Sprint to use their LTE network. It’s what both FreedomPop and Ting have done: http://gigaom.com/mobile/mvno-freedompop-swaps-clearwires-wimax-for-sprints-lte/

#1) It’s not clear that Clearwire will be around in a year, let alone 5.

#2) WiMax<LTE.

I think this is an awesome model, and I'm following this company like a hawk, but I feel as though financing eyeballs with the cost of data connections might be too much to bear. Time will tell.