Accompanying with the liberalization of the Taiwan telecommunication market, mass impact and hostile competition occurred. Since customers have many options, the telecommunication service providers must confront sales shortfall caused by customer churn. In order to avoid continuous customer churn, the telecommunication service providers hope to reduce customer churn rate through aggressively analyzing customer data. Therefore, this study would like to know the determinants of customer churn rate of the mobile phones service. The study employed Descriptive statistics and Logistics Regression to analyze customer data gathered from questionnaires. The results show that duration and value- added services have significant impact on the customer churn. This study suggests that telecommunication service vendors have to carefully look at the behavior of customers with long-term contracts and evaluate the effectiveness of value-added services in the future.