https://www.reuters.com/article/us-sprint-corp-m-a-t-mobile-us/sprint-and-t-mobile-call-off-merger-after-months-of-talks-idUSKBN1D40RY >Sprint Corp and T-Mobile US Inc said on Saturday they have called off merger talks to create a stronger U.S. wireless to rival to market leaders, leaving No. 4 provider Sprint to engineer a turnaround on its own.