How to cancel the number reported as spam on Apple's mobile phone?

Take the iPhone 7plus mobile phone as an example, the operation steps are as follows:

First, open the "Settings" and applications of the mobile phone, as shown in the figure below.

2. Click on the "information", as shown in the figure below.

3. Click on the "unknown and filtered information", as shown in the figure below.

4. Click "Filter Unknown Sender" and close it, as shown in the figure below.