https://www.reuters.com/article/us-sprint-corp-m-a-t-mobile/t-mobile-ceo-takes-the-stand-in-t-mobile-sprint-merger-trial-idUSKBN1YH2CU >T-Mobile US Inc Chief Executive John Legere testified on Friday that he believes U.S. regulators considered Dish Network's history of attempting to build a wireless network when they approved the merger between T-Mobile and Sprint Corp .