Of all the fake, gimpy, tortoise-slow 4Gs of the world, AT&T has historically been far and away the fakest, gimpiest, tortoise-slowest. But the real-deal LTE hotness is coming soon. And as this real-life demo shows, it's going to be blazing.

What you're watching is AT&T's 4G LTE network being put through its SpeedTest paces on an HTC Jetstream tablet. The download speeds of 22Mbps and upload over 6Mbps? While not quite as zippy as the 28 up/10 down AT&T showed off in their labs a few months back, that's still like having a premium broadband package on your mobile device. And knocks everyone else out of the park, based on recent nationwide 4G testing.

Of course, for now you can only access AT&T's 4G LTE network if you live in Chicago, Atlanta, Dallas, and Houston. And all that data pumped to your tablet or phone is going to cost you. But if you were wondering about the future of fast, well, it's here. And it's mighty impressive. [BGR]