The ongoing horse race between the top U.S. mobile operators made the first three months of 2014 quite interesting, as revealed by their first-quarter earnings results. For example, T-Mobile US (NYSE:TMUS) announced record gains, while Verizon Wireless (NYSE: VZ), the largest U.S. operator by subscribers, had a surprisingly disappointing quarter. Research firm Strategy Analytics, in partnership with FierceWireless, tracks the performance of the top U.S. carriers every quarter, looking at the major metrics--such as churn, ARPU and revenue--of each carrier. For analysis of how the top eight U.S. carriers fared during in the first quarter, check out this special report.