https://www.reuters.com/article/us-sprint-m-a-tmobile/t-mobile-pledges-three-year-price-clampdown-if-merger-is-approved-idUSKCN1PT2DF >T-Mobile US Inc told the U.S. Federal Communications Commission on Monday it would not increase prices for three years, with few exceptions, if it gets approval to buy rival Sprint Corp for $26 billion.