How does Shandong Unicom send text messages to check traffic?

Shandong Unicom sends text messages to check traffic, as follows:

Mode 1: Edit SMS. "

CXLL

"(Inquire about the initial letter of traffic) and send it to 100 10, waiting for the SMS to inform you of the traffic balance.

Method 2: Edit SMS and send "4 12" to 100 10 to inquire about monthly subscription, including SMS and traffic.

Both of the above short messages are very simple and convenient. More importantly, texting is free!