How to unlock the spam messages in Apple's mobile phone?

Take the iPhone 6 mobile phone as an example. The logout method is as follows:

First, find "Settings" on the phone desktop, and click Enter.

Second, after entering, find "information" and click enter.

Third, after entering, find "unknown and filtered information" and click enter.

4. After entering unknown and filtered information, find "Filter Unknown Sender" and close it.

5. After closing, it will be as shown below, thus removing the function of intercepting spam messages.