reply to kmand
Re: LTE Compatibility? Yes quite a few.. For example the iphone 5 on AT&T has 700 and AWS as far as i know, same with the galaxy s3. Canadian providers are selling this same model and using the AWS LTE right now, while AT&T uses the 700. AT&T and the Canadian providers also have HSPA on the same frequencies of 850 and 1900.
I think when Karl talks about them using HSPA 1900 and LTE AWS so that people can bring phones from other providers to T-Mobile, he is talking about phones like the iphone 5 and the galaxy s3 sold on AT&T.