Every major US carrier offers some form of 4G connectivity. Unfortunately, not a lot of people are offered the technology because the rollouts of every type of 4G network usually take a long time, and it's always the larger cities to get the good stuff first.
AT&T is one of those major carriers, obviously, and it's promising to build out the rest of its LTE network by the end of 2013.
That gives Ma Bell a little less than two years to cover its customers in an LTE blanket of love. Verizon seems to pump out new cell towers every week in a multitude of cities, so hopefully AT&T can take a hint and do the same.
Of course, I'm a little skeptical as to whether AT&T can actually get the network completed by then. It had originally planned for the rollout to be completed by the end of 2011, and there are still places that are stuck on the carrier's crappy EDGE network, including where I live. Promises are easier made than done, and I would be a very happy man if the rollout was completed within even three months of that deadline.[Yahoo!]