How does Unicom check the phone bill and traffic? Is it free to call customer service

You can check the phone bill and traffic usage through SMS, online business hall and mobile phone business hall. Direct dial 100 10 Unicom customer service hotline is free. The query method is as follows: 1. After logging in to Unicom's online business hall with your mobile phone number and service password, click "self-service" to see "available balance" and "current month's phone bill"; 2. After logging in to the mobile phone business hall with the mobile phone number and service password, you can query the phone bill and account balance information of the current month in the "phone bill query" column of the query interface; 3. You can also send a text message "CXYE" or "YE" to 100 10 to check the phone bill balance. In addition to the above methods, you can also call the Unicom customer service hotline 100 10 or directly inquire in the business hall.