What is an activation message?

Activation SMS refers to a communication password that software or some services send to the holder's communication equipment through the server. Through this activation message, the corresponding service can be started. No matter what function is activated, we can't tell others the password of this short message. Because doing so will give the liar an opportunity. Open an application or service that does not need to be opened in some way. Of course, these activation messages are generally time-sensitive and will take effect after a specified time, so they should be retrieved.