APP registration, why do you need SMS verification code?

APP registration uses verification code mainly for security, and secondly for enterprises to obtain the user's mobile phone number. You know, with the popularity of the Internet and mobile Internet, mobile phones have become the "key" to access the Internet. Coupled with the commercialization of enterprises, in order to better link groups and individuals and spread information efficiently, mobile phone verification will become the mainstream, and apps and websites with little commercial value will not use SMS verification. On the one hand, there is the cost of SMS, and there is basically no important information. My humble opinion, hope to adopt!