This is a big deal because just over three years ago, T-Mobile was the number 4 carrier in the US. Nobody even wanted to deal with switching carriers because every carrier, including T-Mobile, had stopped offering unlimited data and their plans become so unclear. While Sprint was the only carrier at the time that offered unlimited data, its network was so bad in some areas, there wasn't even contest. T-Mobile has beaten the US largest wireless carrier: Verizon, in the number of smartphones sold in Q1 of the US mobile market. Metro PCS and T-Mobile, combined, sold 22.9% of smartphones while...
Source: http://www.gsmarena.com/tmobile_sells_most_smartphones_of_any_other_carrier_in_the_us-news-18544.php
