Use App to generate verification code instead of SMS verification code?

However, it is impossible to verify whether it is a real user registration operation APP unless the user's mobile phone number or email address is bound, but verifying the user's identity is complicated and the experience is not very good. Therefore, most apps that need to verify the user's identity now use SMS verification code or supplement a third-party login method. Of course, checking the local number by "spot check" is also a way for users to realize identity verification without entering a verification code.