This will run on T-Mobile and AT&T's 3G networks. It works great on AT&T's HSPA network for me, and I imagine it'll work fine for T-Mobile's as well. I'm prett

This will run on T-Mobile and AT&T's 3G networks. It works great on AT&T's HSPA network for me, and I imagine it'll work fine for T-Mobile's as well. I'm pretty sure that it covers all GSM bands used by carriers in the US.