How does iphone mark harassing calls?

According to the inquiry, IT network knows that the method of iphone marking harassing calls is:

1. First, find the "Phone" icon on the iPhone home screen and click Open.

2. Find the strange phone number you want to block in "Recent Calls" and click "Details" on the right side of the phone number column.

3. Find the option of "Block this calling number" at the bottom of this phone number file information, click it, and then click "Block contact" in the option that pops up at the bottom.

IPhone is a series of smart phones developed and sold by Apple, which is equipped with the iOS mobile operating system developed by Apple itself. The first generation of iPhone was released on June 9, 2007 by Steve Jobs, then CEO of Apple, and officially released on June 29 of the same year.