China Unicom has been sending test messages. What do you mean?

Unicom has been sending test messages because the number is selected by the system for testing.

When Unicom background technicians test information, they will send some test messages. These short messages will not affect the actual experience of users. Users don't need to worry too much about this. They can call the calling card operator and ask to stop these test messages.

Please note that in order to ensure the security of personal information, it is not recommended to make phone calls or send text messages from unknown sources at will.