How does Unicom use SMS to query the remaining traffic and SMS?

Unicom 3G and 4G mobile phone cards send short messages CXLL or 107 1 to 100 10 to inquire about traffic usage. You can also query the mobile phone traffic in the following ways: 1 log in to the online business hall and click "phone bill query" > "usage query" > "Internet query" to query the usage of mobile phone Internet traffic; 2 after logging in to the client of the mobile phone business hall, click "service" > "query" > "internet traffic" on the home page to query the mobile phone internet traffic in the current month; You can also call the local manual customer service hotline or directly check the mobile phone traffic in your business hall.