Verizon Wireless once again claimed the top spot among US carriers in terms of customer loyalty. The company reported today that its second quarter churn rate was 0.84 percent. Verizon edged out the unnamed second place finisher, which tallied a 0.97 percent churn rate. Third and fourth place carriers saw churn rates of 1.79 and 2.1 percent. Churn measures the percentage of customers who leave their wireless providers in a given period. Verizon's churn figures represent only wireless customers with postpaid contracts.