A new study of loyalty among mobile phone users in the U.S., released by WDS, A Xerox Company, has worrying implications for wireless carriers. The WDS Mobile Loyalty Audit 2013 reveals that 36 percent of U.S. customers are considering leaving their mobile carrier in the next 12 months. The study, which integrates new survey data from research specialist TNS, also finds that only 13 percent of customers show the level of loyalty required to protect them from competitive offers and service disruptions.