Postpaid churn, or the number of postpaid subscribers that stop using a provider’s service during a specified period of time, is always a stat industry watchers keep an eye on when it comes to wireless carriers. Why? The U.S. wireless market is so saturated that most new subscribers a carrier sees in any given quarter are coming over from another carrier. With fourth-quarter financial results from each major carrier on the way, Cowen and Company has published its Q4 study on subscriber intent with regard to switching wireless service providers. Who might be the biggest winners and losers of Q4 when it comes to postpaid churn? Cowen’s new study could give us a good idea. According to the firm’s survey, which