T-Mobile US operates independently of Deutsche Telekom, almost like a totally different company that happens to have the same brand name. Being mostly independent, TMUS have actually dropped a lot of the "heavy carrier" aspects. For instance:
> Bandwidth caps. Trying to push Netflix and Google Video out of the network for promoting their on in-house service
T-Mobile US actually gives you "free" low-quality Netflix and YouTube video streaming, without counting that against a subscribers data limit. http://www.t-mobile.com/offer/binge-on-streaming-video.html
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T-Mobile US isn't the only example of this. "Virgin Mobile USA" is just a brand name slapped on prepaid Sprint phones. Besides licensing the brand, there has been no affiliation between Virgin Group UK and Sprint "Virgin Mobile USA" for many years now.