For the second consecutive time, Overland Park-based Sprint ranked last in performance nationwide, according to the independent carrier test group RootMetrics Inc. Sprint Corp.'s network was rated the worst overall performing among the nation's top four carriers in both Kansas City and the entire U.S. For the second consecutive time , Overland Park-based Sprint ranked last in performance nationwide, according to the independent carrier test group RootMetrics Inc. Also for the second time in a row, Sprint's nearest rival, T-Mobile US Inc., was rated No. 1 in Kansas City while Sprint took fourth in its hometown .