The percentage of customers disconnecting service each month. All-in churn represents the percentage of the total customer base that disconnects service each month. Post-pay churn represents the percentage of the customer base on post-pay service plans that disconnects service each month. Post-pay service plans are those in which customers are billed in arrears for service, such as customers who are on contract.

Churn rate is also sometimes called attrition rate. It is one of two primary factors that determine the steady-state level of customers a business will support.