Not yet, Tmo 4g is currently on a different frequency the radio in the i927 doesn't use, but rumor has it they're going to utilize 800mhz (current 2g spectrum) for 4g by the end of the year since their 2g is way under utilized at the moment...
Galaxy S3 T999 PB
Samsung Captivate Glide on loan to dman3285
WTT/WTS, all full retail boxed:
Unlocked T-Mobile G2 (HTC Desire Z / Vision) $130
T-Mo Dell Streak 7" in an Otterbox Defender $175
Samsung Captivate Glide (SGH-i927)
T-Mo Samsung Galaxy SII (SGH-T989)
HTC Sensation Z710E
ViewSonic G-Tablet 10.1"
Samsung Galaxy Tab 7"
Samsung Galaxy Tab 10"
HTC Evo View 4G