How does China Telecom send short messages when checking traffic?

China Telecom's specific methods for checking traffic by SMS are as follows:

Turn on the SMS function.

Click Edit SMS to send SMS.

The receiver writes "1000 1" with the content of "702".

After editing, click Send.

After successful sending, wait for a period of time, and you will receive a short message from the telecom. If the server is busy, it will be delayed for a while.

Click Open SMS to view the details as shown in the figure below, and you can know the traffic of the query.