Why is every DF post ending up here on HN? For comments perhaps? Google / Google Voice / Gizmo5 or any SIP provider offers data calls. I've been messing around with this on my iPad and it's very close to being viable. There's no question it is on Android. I hope Apple keeps moving in this direction but I doubt they'll be the first to route around the carriers. Right now all signs point to Apple being happily engaged…
Internationally Apple works with dozens of carriers, frequently more than one in a territory. This is still the company whose CEO referred to carriers as "orifices" not so long ago. They're going to keep putting a brave face on the AT&T relationship right up until the morning when they announce an alternative.
The only viable alternative to ATT currently would be another carrier. IE, the logic of the original post was rather strained.