Verizon comes out ahead of rivals AT&T, T-Mobile and Sprint in nearly every category of performance in a new study of the U.S. wireless market by RootMetrics. However, the report says T-Mobile made noticeable improvements in larger cities, based on the wireless company’s ongoing investments in metro areas. According to the RootMetrics data, T-Mobile came out ahead of Sprint in overall performance and logged its best overall result yet in head-to-head comparisons in urban areas.