How does iphone intercept the take-away call of Meituan?

Upgrade iOS 13 system. After upgrading to iOS 13, the silenceunknowncallers function in iOS 13 can help you automatically intercept any unknown calls and automatically send these harassing calls to voice mail. The anti-harassment function of iOS 13 can be turned on or off according to the user's preference. When we turn on this option switch, whether it is a local number or not, iOS 13 will use Siri intelligence to compare the incoming number with the numbers in contacts, emails and messages. Any phone number that can't be found in these places will be transferred to voice mail. In short, it can be said that it is "silent" and I don't know that there are harassing calls coming in.