Non pentaband galaxy nexus?

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http://forum.xda-developers.com – I am planning to buy a Galaxy Nexus. But how can I be sure that the one I am buying does work on 1700MHz? I heard that not ALL Galaxy Nexus are pentaband (European? Australian?), I am not sure is it true or not. Anyway, Is there any way I can check when I purchase one? I am really concerned about that since I am planning to use in Tmobile USA Any help will be appreciated!! Thanks guys! (HowTos)