Verizon Wireless and AT&T Mobility solidified their dominance of the U.S. wireless market during the second quarter of 2012, with each reporting overall gains in postpaid subscribers and churn below 1 percent. Meanwhile, national competitors Sprint Nextel and T-Mobile USA continued to struggle, with Sprint losing 246,000 postpaid customers in the quarter, (due mainly to iDEN troubles) and T-Mobile USA losing 557,000. Furhter, Philip Kendall, director of wireless operator strategies for research firm Strategy Analytics, said Verizon and AT&T generated five to six times the EBITDA of Sprint and T-Mobile during the three-month period. Read more about the top U.S. mobile operators' second-quarter performances in FierceWireless' Editor's Corner.