Why is it wrong to log in to the APP and display the SMS verification code?

It may be that the network is not good, so the verification code was not received in time.

The login verification code will change every time the page is refreshed. If you are prompted that the verification code is wrong, the system will replace the verification code. At this point, the page may still be the previous verification code, and the slow network speed will lead to the failure to replace the verification code in time.

Verification code can prevent malicious password cracking, ticket brushing and forum flooding, and effectively prevent hackers from constantly trying to log in to specific registered users by using specific program brute force cracking methods.