Nn accelerator cannot send verification code.

Nn accelerator can't send SMS verification code, maybe your mobile phone number is wrong or the network is delayed, so you can't send verification code.

The verification code 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.