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Dial *#*#4636#*#* and you got the option for LTE
I know it's not Android but the Nokia Lumia 810 has an update coming soon that will enable T-Mobile LTE on it.
Nokia Lumia 810 To Receive Software Update Enabling LTE? Signs Point To yes | | TmoNewsTmoNews
The work around is easy too. I didn't have a reason to unlock the bootloader until now. All you gotta do is flash the radio from 4.2.1.