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According to GSMarena.com, the Indian model (XT1644) should have the same 3G bands as the US model (1, 2, 5, 4 & 8). Where it's really different is with the LTE bands. It has 1, 3, 5, 8 & 40. T-Mobile only uses band 5 LTE in Myrtle Beach, SC and no one in N. America uses the other LTE bands.
It part it depends on where you are located. Most markets should have 3G on either band 2 or 4. I think in a few markets T-Mobile has eliminated 3G altogether.
Can you set your phone into 3G-only mode? If so, what happens?