Ensure the security of the account. True Fun is a social software that requires users to register and log in. When registering and logging in, Zhenyouqu will send a short message verification code to the user's mobile phone to verify the user's identity and ensure the security of the account. Users need to enter the correct verification code to complete the registration or login operation. SMS verification code is a commonly used authentication method, which can effectively prevent malicious login and protect the user's account security.