The specific operation steps are as follows:
1. First open the phone and download the installed Baidu Mobile Guardian software.
2. After entering the Baidu Mobile Guardian page, select the "harassment interception" option.
3. After entering the harassment interception page, select the "Blacklist" option, as shown below.
4. After opening the blacklist page, select and click the "Add blacklist" button below.
5. Then select and click "Number Area" as shown in the figure below.
6. Finally, you can choose the interception area according to your own needs.