How to prevent malicious harassing calls?

1. Open the security center that comes with the mobile phone system. You can find the Security Center icon on the phone desktop. As shown in the figure below.

2. Click the security center icon to open the security center page;

Displaying the detected mobile phone safety index at the upper part of the page; On the right side of the middle position, we see "harassment interception"

3. Click "Harassment Interception" to jump to another page;

There are two items at the top of this page, one is SMS and the other is incoming call.

4. "SMS" is currently displayed, and the content below shows that a SMS has been intercepted at present.

In the middle position, we see "intelligent interception rules"; Let's click to enter.

6. Click in and go to another page, where there are five options for us to choose settings. We can make some independent settings for SMS and call interception;

Currently, it is intelligent interception. We can also choose to block only blacklists, strangers, non-whitelists or all of them. Just click on the one you need.

8. In the "black and white list", there are four items that can be customized to block SMS and incoming calls.

For example, click on "keyword blacklist"; Go to another page and click "Add" at the bottom of the page to add some keywords. Short messages with such keywords will be intercepted by mobile phones. This avoids being harassed by these short messages.

Please add a detailed explanation.