Wireless companies today measure voluntary churn by a monthly figure, such as 1.9 percent or 2.1 percent. This is the average number of customers who quit their service per month. Annual churn rates for telecommunications companies average between 10 percent and 67 percent.Industry retention surveys have shown that while price and product are important, most people leave any service because of dissatisfaction with the way they are treated.hurn reduction in the telecom industry. Churn reduction in the telecom industry. By Arthur Middleton Hughes. All industries suffer from voluntary churn -- the loss of customers to some other company.