Unless you get their oddball 1700Mhz 3G service that no datacard supports.
T-Mobile compatible 3g data cards exist. I owned one. Option gt 307. Got on average 1100/350 kbps. T-Mobile just doesn't sell it. Stelera wireless in Oklahoma sells them unlocked. Last i checked, the 3g data card from them cost about $200.00
·
·