That's pretty good, considering most other smartphones don't come close to those sales numbers in such a short time, even if they're offered on multiple carriers. It's also impressive because the iPhone 5 launched about eight months ago.
In previous earnings statements, T-Mobile has blamed the fact that it didn't carry the iPhone for losing subscribers to other carriers that did. T-Mobile has also changed the way it charges for service plans, eliminating contracts and letting customers pay month to month instead.
The carrier no longer requires customers to sign a two-year contract to get a subsidized smartphone. Instead, customers can make a down payment on a phone and pay it off gradually over two years. For example, T-Mobile sells the iPhone 5 for $100 down plus $20 per month for 24 months.
T-Mobile also reported $1.2 billion in earnings for the first quarter of 2013 before taxes, interest, depreciation, and amortization.