Is the written notice of China Southern Power Grid sent by SMS?

According to the test records of previous years, China Southern Power Grid generally informs candidates to take the written test by SMS.

The contents of the notice generally include: the name of your company, the written test time, the written test place, the contact information of the person in charge, and the phone number of the person in charge who needs to reply "name+phone number+whether to take the test" after receiving the text message.