I just read on engadget that T-Mobile is about to refarm its whole frequency spectrum:
The current GSM spectrum in the 1900MHz will be largely rededicated to UMTS/HSPA, which will eliminate handset incompatibility for 3G for many devices including the iPhone, so you don't need an AWS-compatible handset for 3G access anymore. Instead any device supporting AT&T's 3G network will also work on T-Mobile's network.
Given this increase of capacity (or better: spectral efficiency) in the 1900MHz band T-Mobile will further rededicate some of the AWS spectrum to LTE.
T-Mobile will still have a very hard time to compete with the other US carriers who own a lot of spectrum on lower frequency bands, anyway this will be a significant improvement in my eyes.
more sources: http://www.tmonews.com/2012/06/t-mob...san-francisco/ http://www.engadget.com/2012/07/11/t...-2g-discounts/