"T-Mobile has stepped up its game recently in an effort to compete with Verizon, AT&T and Sprint in the United States. The carrier recently announced 4G LTE service in seven markets, and many customers will find that their phones will fall back to its still fastHSPA+ network where LTE isn’t available. In addition, several of its new handsets offer HD voice support to other HD-voice enabled devices, and calling over Wi-Fi networks. That’s not all.."
Via Mo Hall, Fang Feng