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Early Thursday morning, we passed along T-Mobile's second quarter earnings report; for the most part, it was a strong three months for the carrier, although the view was a bit murky thanks to the inclusion of MetroPCS for two of the three months in the quarter. The nation's fourth largest carrier started selling the Apple iPhone 5 on April 12th, which helped T-Mobile sell 4.3 million smartphones in the quarter...
Source: http://www.phonearena.com/news/The-Apple-iPhone-made-up-20-of-T-Mobiles-smartphone-sales-in-Q2_id46218