Convergence, in any meaningful sense, can't really happen until you can use a single radio & protocol for all of your data and voice needs. "Smartphones" are, at best, hack jobs on the same level as my Debian chroot hack. They cleverly disguise the fact that they are putting two separate worlds (voice and data) side-by-side, and make it look like those two worlds are "converging". They aren't. The fact they are living on the same device doesn't make them "converged". They're not truly united, they're only uneasy roommates, always jostling each other around in your tiny box.