The third quarter earnings season is coming to a close, and the major U.S. wireless carriers have reported their earnings. AT&T Mobility and Verizon Wireless gained customers, while Sprint Nextel and T-Mobile USA lost subscribers. Subscriber growth at flat-rate carriers Leap Wireless and MetroPCS slowed in the quarter. Research firm Strategy Analytics compared the top 10 U.S. carriers, and looked at the major metrics--including churn, ARPU and revenue--of each carrier. How do they stack up? Special feature