Mobile US said Thursday it is launching a new service with unlimited talk, text and high-speed smartphone data. The new product, called T-Mobile ONE will be priced at $40 a line for a family of four. "The era of the data plan is over," Chief Executive John Legere said in a statement. A T&T Inc. said Wednesday that it will launch new data plans that end data overage charges for wireless customers on August 21. T-Mobile shares were not active in premarket trade, but are up 19% in the year so far, while the S&P 500 has gained about 7%.
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