Why do I get so many harassing calls?

If personal information is leaked, set "harassment interception" in the mobile phone, enter the setting page and click "number blacklist". Enter the switch number and click OK to complete the setup. The detailed steps are as follows:

1. Click "Call" button.

2. Click on the "three points" sign in the lower right corner.

3. Select "Harassment Interception" in the pop-up list.

4. Enter the harassment interception page and click the "Settings" button in the upper right corner.

5. Enter the settings page and click "Number Blacklist".

6. Enter the number blacklist page and click the "Add" button.

7. Select "First Number Match" in the pop-up list.

8. Enter the switch number and click OK to finish the setup.