How does Unicom use SMS to inquire about the usage of the package?

You can send a message CXYL or YL to 100 10 to inquire about the usage of the package (this information is free), or you can also inquire through the online business hall of China Unicom and the client of the mobile phone business hall. 2. log in to the online business hall of China Unicom, and click "phone bill inquiry" > "balance inquiry" to inquire about the usage of the package (including voice phone minutes, internet traffic value, SMS, MMS and other contents). 3. Log in to the client of China Unicom's mobile phone business hall, and click Service > Query > Remaining Query. In addition to the above methods, you can also call local customer service or inquire in person in the business hall.