https://www.reuters.com/article/us-t-mobile-us-ceo/t-mobile-ceo-legere-to-step-down-next-year-idUSKBN1XS1QJ >T-Mobile US Inc Chief Executive Officer John Legere will step down next year, the company said on Monday, less than three weeks before it goes to trial to determine the fate of its planned $26.5 billion merger with smaller rival Sprint Corp.