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AT&T has been adding a little dash (and asterisk) of 4G to all its phones as of late, but not all of those handsets are created equal -- the Motorola Atrix 4G, HTC Inspire 4G and HP Veer 4G are technically capable of only HSDPA Category 10, which equates to maximum download speeds of 14.4Mbps. Not so for the new Samsung Infuse 4G, as it's been boosted to HSDPA Category 14, which bumps its particular flavor of 4G up to 21Mbps. That has AT&T playing in the same arena as T-Mobile, assuming that your local cell towers have the fiber backhaul in place... and assuming that T-Mobile doesn't make good on promises to deliver some 42Mbps (HSPA+ Category 20) handsets before AT&T catches up. And yes, the uploads should be fine, too -- AT&T says the Infuse 4G supports HSUPA Category 6, which should give us maximum rates of 5.76Mbps when firing files into the clouds.

We've seen it powered down and had it dangled in front of us and now, four months after its launch, we've finally had a chance to play with a real, working Samsung Infuse 4G. This 4.5-inch superphone -- the biggest Sammy has made to date -- feels surprisingly light in the hands, despite its width. That's largely thanks to its crazy-thin 8.99mm profile, along with a subtly textured backside. The Super AMOLED Plus display -- the same kind found on the smaller Droid Charge -- which promises to be brighter than Super AMOLED as well as easier to view in direct sunlight, is simply stunning. We were seriously impressed by the punchy colors and deep blacks, although that outdoor test will have to wait for another day. Blessedly, Samsung lets those vibrant colors speak for themselves -- it loaded the phone with Android 2.2 and  abstained from saddling it with its TouchWiz UI  made its TouchWiz UI less intrusive out of the box. The handset packs a s...