Below we have put together three charts detailing some key metrics from the top five carriers in the U.S.: Alltel, AT&T, Sprint Nextel, T-Mobile USA and Verizon Wireless. (That was alphabetical order.) Check out the tables below to see how these carriers stack up from Q2 2006 until Q2 2007 when it comes to churn, ARPU (Sprint's is postpaid only) and net subscriber additions.