T-Mobile compatability?

[runtmms]

Is anyone using this phone on T-Mobile? My brother wants to know if it will work on Solavei. As far as I can tell to get 4g you need the 1700MHz band, which this phone doesn't appear to have. But to add to my confusion the T-Mobile version of the GS3 doesn't appear to have this band either. I'm trying to understand the performance/network compatability of this phone.

Thanks.