NEW YORK—Witness testimony began Dec. 9 over an effort by U.S. state attorneys general to stop T-Mobile US Inc. from buying Sprint Corp., in a case that highlights disagreements between federal antitrust enforcers in powerful states.
Attorneys for 13 states and the District of Columbia, led by New York and California, are seeking to prove in Manhattan federal court that a plan to combine the No. 3 and No. 4 wireless carriers would push up prices, particularly for users of prepaid plans. The state officials asked Judge Victor Marrero to order the companies to abandon the deal.
