Is the Atrix 4G 3G tri-band 850/1900/2100 ??

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Can anyone confirm if the ATT Atrix 4G supports tri-band 3g 850/1900/2100?

GSM arena states it supports all three frequencies
http://www.gsmarena.com/motorola_atrix_4g-3708.php

But both amazon and walmart list the 3g bands to only support 850/1900

I'm currently in hong kong and the primary 3g band is 2100 so this will definitely affect my decision to buy the phone outright.

anyone with the atrix overseas with input would also be greatly appreciated!
Thanks for your help!

Go to www motorola dot com/atrix there is tech specs it supports 2100.

It doesn't support 1700 though which is critical to functioning correctly on TMO's network....

Too bad, tmobile's 4g is much more widespread and reliable than AT&T. It's sad that from a 4G/data perspective, AT&T is by far the worst carrier.