beats me wrote: This could in theory prevent overage charges because you'd be going through your nextwork instead of hitting any antennas. This would also allow you to get a better connection when the antennas are shit in the area but you have wifi.
therein lies the problem...
besides Steve is currently angry about wifi
you still have bandwidth issues to contend with and the limitations of dropped connections. so even though your phone is working great at Starbucks, when you go around the corner and the connection drops you have to have/find a new connection. this can't be done seamlessly without the "owners" of the access points meshing the signals together so you could hop from one to the next. I could see it working in some place like a mall in the future where connections share a similar arrangement of sorts that makes them part of a whole, but as long as they remain completely separate entities... results WILL vary.
give it time. remember bag phones... powered by the cigarette lighter in a car? pagers?
not so long ago really....