An industry term, which refers to customer turnover. A wireless subscriber is said to “churn” when they cancel their mobile service with their current wireless carrier. A subscriber may either “churn” to another carrier, or they may simply choose not to have any wireless service. Churn is measured on a monthly basis. To get the total churn for a given period (typically quarterly or yearly) the monthly churn percentage is multiplied by the number of months in the period being measured. For instance, a carrier with 2% churn per month would have a quarterly churn rate of 6%, and an annual churn rate of 24%.