If you're a citizen of San Francisco and own an LTE capable phone on AT&T's network, you're in luck. It appears that the carrier's new 4G LTE network is now live in SF. While it hasn't been officially announced, it seems to be going strong. If you're in the area, fire up your device and prepare to have your hair blown back.
Interestingly enough, New York City started seeing some high-speed love at the end of last week, but it has only been live in certain parts of the city.