Nokia Lumia 920 will work on T-Mobile USA's HSPA+ network.

The Nokia Lumia 920 apparently supports WCDMA on the AWS band which means that it is compatible with T-Mobile's HSPA+ network. http://mobilesyrup.com/2012/10/31/rogers-nokia-lumia-920-confirmed-to-be-pentaband-compatible-with-wind-and-mobilicity-out-of-the-box/