General 4G on T-Mobile with Atrix 2!?

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http://androidforums.com – I was under the impression that I couldn't get 4G on T-Mobile because the Atrix 2 doesn't have T-Mobile's 3/4G bands, only AT&T's 3/4G bands. Well, as I am making this very post, my Atrix2 is screaming along on 4G, using Walmart's Family Mobile that uses a T-Mobile SIM. This isn't the first time, anyone have a clue on why this is happening? Not complaining, just curious. Jerry (General)