Joke Collection Website - Public benefit messages - How does Unicom query the remaining call time, SMS and traffic?

How does Unicom query the remaining call time, SMS and traffic?

Call 100 10.

It is ok to check the account balance by sending text messages. The received text messages are "102" to "100 10".

Query traffic. At present, Unicom's 3G query traffic is unified, and it can send "CXLL" to "100 10".