What SMS does Unicom send to check traffic?

Unicom sends a text message cxll to 100 10 to check the traffic; The specific operation method is:

Equipment model: Apple XR

Equipment system: iOS 12.4

1. First, open the phone and click the desktop information; As shown in the figure.

2. Then click the new icon in the upper right corner; As shown in the figure.

3. Then add the recipient as Unicom10010; As shown in the figure.

4. Finally, click the short message cxll and send it to 100 10 to inquire about the traffic usage of the mobile phone in the current month; As shown in the figure.