How to stop others from texting their numbers?

Operating tool: vivo X9

Operating system: Funtouch OS 7. 127.

1. On the mobile phone desktop, open the SMS application.

2. In the short message, click the option in the upper right corner of "...".

3. Then, click to open the "Settings" function.

4. In the setting interface, click the "harassment interception" option.

5. Find the "SMS Interception" option and click it.

6. Click the "keyword blacklist" option, as shown in the figure.

7. After entering, click the "Add" option at the bottom.

8. Enter the keyword "verification code" and click "Save".