Expansion of Wideband LTE into 16 total markets, giving all T-Mobile LTE devices a speed boost with peak network speeds up to nearly 150 Mbps.
Expansion of Voice over LTE (VoLTE) to more than 100 million people in 15 total markets, doubling the amount of data dedicated to voice calls for highest quality HD Voice and faster call setup times.
More on new music service options I like what they are doing here with the music side of things stream from all 6 providers and it will not go against your data plan.