How does android server send verification code to mobile phone?

The user must first fill in the mobile phone number and then request to send the verification code. After receiving the request, the server sends a verification code short message to the user's mobile phone.

Of course, you should set up your management system (on the server) first. For example, if the user requests a verification code, first, the mobile phone number of ta and the sent verification code are saved on the server. Then, when the user submits a registration request, first verify whether the mobile phone number and verification code submitted by the user are consistent with the previously stored verification code and mobile phone number in the database. If it is consistent, let ta register; If not, an error message will be returned.

If you send a short message, you can find a company that provides a short message interface online. With this permission, the system can send short messages on any mobile phone.