Motorola files dozens upon dozens of FCC certifications a year, so what makes us so sure this here IHD-P56LS1 is the might Atrix 4G for AT&T? Fair question: for one thing, it's got 850 and 1900MHz 3G (or 4G, in AT&T parlance). Furthermore, it's approved for 5GHz 802.11n WiFi, which is extraordinarily rare for a phone -- and it was a feature Moto was sure to pimp during the Atrix's CES unveiling. Oh, and finally, it's identified in the filing as model number MB860, which would be the Atrix's model number. So yeah, there's one more checkmark to tick off prior to release... which hopefully won't be too much longer, because we're seriously jonesing to do some laptop docking.

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