AT&T have been adding a touch dash (and asterisk) of 4G to all its phones today, but not all of these handsets are created equal — the Motorola Atrix 4G, HTC Inspire 4G and HP Veer 4G are technically able to only HSDPA Category 10, which equates to maximum download speeds of 14.4Mbps. Not so for the recent Samsung Infuse 4G , as it has been boosted to HSDPA Category 14, which bumps its particular flavor of 4G as much as 21Mbps. That has AT&T playing in an analogous 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 must be fine , too — AT&T says the Infuse 4G supports HSUPA Category 6, which should give us maximum rates of five.76Mbps when firing files into the clouds.
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