What should Unicom send to 100 10 to check traffic and SMS?

Unicom card with SMS query traffic, available in the following ways:

1, and send the short message "4 12" to 100 10 to inquire about the mobile phone package and its specific usage.

2. The short message "cxll" edited by the mobile phone is sent to 100 10, so you can query the traffic usage and remaining traffic this month.