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.