T-Mobile US unveiled a service Wednesday under which subscribers can trade in their phones twice a year and "Jump" to a new device for an additional $10 a month. At a media event, the carrier also said its market share grew in May in several large cities. "Our churn is lower than it has ever been," said CEO John Legere, who added that the growth was related more to its service strategy than to its adoption of the iPhone. Legere also said T-Mobile has built its Long-Term Evolution network past 157 million people in 116 markets, surpassing the company's midyear goal of 100 million people.
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