Why didn't Jilin Public Security receive the verification code?

1. First, make sure that the mobile phone number filled in by the user is his own valid and accurate number, otherwise the verification code will definitely not be received.

2. Make sure that the mobile phone is in a normal networking state, otherwise the registration application cannot be submitted.

3. The user's own mobile phone number has been blocked by the system. You complained to the operator that this notification message was spam, which caused the message to be blocked. You need to contact the operator to solve this problem.

4. Blacklist settings such as SMS security software. You have set the blocking rule in SMS and set it to unblock it.

Reason 2: Software problem.

Due to the large number of registered users, Jilin Public Security cannot receive the verification code for the time being. Users can wait patiently or register at other times.

CAPTCHA (Captcha) is a public automatic program, which is used to distinguish whether the user is a computer or a person.

Verification code is widely used in many websites, which can not only prevent malicious password cracking, ticket brushing and forum flooding, but also effectively prevent a hacker from constantly trying to log in to a specific registered user by using a specific program brute force cracking method.