How does iphone report phone numbers?

The step of report that phone number on the mobile phone include using the built-in function and using the third-party application.

1. Use the built-in function: In ios 13 and later versions, you can turn on the function of "mute unknown calls" to avoid answering strange calls.

2. Use a third-party application: You can go to the appstore to download an application that can detect and stop harassing calls. Several application developers have provided this function, and you can choose the appropriate application according to your own needs.