Wayne @ GearDiary caught wind that the Sprint Airave will be released July 15th. I actually saw a demo of this at the Sprint corporate offices a few months back and it was beautiful. The Airave is essentially a mini cellphone tower that routes all of your calls over the internet. Kind of like UMA but without the WiFi part.
This would save you money on calls and give you reception in locations where you might not have. While I was at Sprints corporate offices I asked them if I could use the Airave while traveling. I was sad to learn that it has a built in GPS chip that only lets it work where Sprint has coverage!!! SUCKS. You also need to keep the device near a window so it can get a GPS fix.
You will need to pay for an extra service to use the Airave. According to Wayne this should be $15 for an individual or $30 for a family. You do get unlimited calling over the internet with the plan so its not a terrible deal.
Pretty interesting stuff. I think they need to lower the price and lose the GPS restriction. Check it out on Sprints site at this link.