I can't get the verification code for the reserved subject. What's the matter?

The reason why I can't receive the reservation theme verification code is because the SMS center is busy and the signal is not good.

1, SMS center is busy: within a certain period of time, SMS center is too busy, resulting in the delay or loss of SMS. At this time, the only solution is to wait patiently for a period of time, and then try to get the verification code after the SMS center buffers it.

2. Bad signal: there will be a corresponding time limit for entering the verification code. If you are in a place with poor signal, the time to receive the verification code will be delayed, resulting in the failure of the verification code.

3. The verification code is a public automatic program, which is used to distinguish whether the user is a computer or a person. It 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. In fact, using verification code is a popular way for many websites now, and this function is realized in a relatively simple way.