T-Mobile's official Q1 2016 results were posted and they are doing extremely well by any metric. Not only did they add over 2.2 Million new customers, they also raked in around $479 Million in profit on $8.6 billion total revenue. Here's a few more handy stats worth noting from the report: this is actually the 6th time in the last 7 quarters that T-mobile added 2 million (or more) customers, and this is the 12th consecutive quarter in which T-Mobile added more than 1 million customers.
For even more info, here's the report: T-Mobile