T-Mobile posted a stronger-than-expected revenue for the second quarter. The fourth biggest mobile carrier in the US announced that its total earnings rose by 27.5% from last year's second quarter.

T-Mobile disclosed that, "iPhone sales have accounted for approximately 29% of T-Mobile's branded gross customer additions and upgrade smartphone sales." The company was the last main carrier in the US to offer Apple's iPhones. It only started selling the tech titan's flagship smartphone on April 12, 2013.

"T-Mobile's Un-carrier approach has clearly resonated with consumers. By fixing the things that drive them mad, like contracts and upgrades, and freeing them from the two-year sentences imposed on them by our competitors, they are choosing the new T-Mobile in unprecedented numbers," T-Mobile's President and CEO, John Legere.

Overall, the company was able to add 1.1 million new subscribers during the second quarter. According to Consumer Intelligence Research Partners, T-Mobile kept roughly 300,000 to 400,000 of its current subscribers from switching to another mobile carrier because of its iPhone offerings.