How does Unicom check traffic and send text messages?

1. First, Unicom sends short messages "HFMX" or "CXLL" or "CXYE" or the number "107 1" to 100 10.

2. Then, to inquire about the traffic balance in the package, you need to send a short message "TCYL" or "CXTCYL" to 100 10.

3. Finally, to query the current month's traffic surplus, you need to send a short message "10 1" or "HF" to 100 10.