Besides SMS verification code and voice verification code, are there any other ways to verify the registration of APP?

As a mainstream verification method, SMS verification code has a huge scale, but there are also many problems. The arrival rate of SMS verification code is greatly influenced by operators and SMS gateway technology. Many APP companies also want to seek alternative products. Voice verification code can solve the problem of arrival rate, but high concurrency is impossible. Recently, I contacted a third-party service tool, CIA Easy Authentication (formerly known as CIA Authentication). Through signaling interaction technology, the Internet and communication network are used for comparison and verification, instead of SMS verification code. This is a technological innovation. The subject may wish to know about it and hope to adopt it!