Why does Smartisan phone not have verification code protection function?

Verification code protection is not turned on.

1. First open the phone and click the settings button on the screen.

2. Next, scroll down to find the security button and click to enter.

3. Then click Search in the security bar, enter the verification code for protection, and click to enter.

4. Finally, find the smart SMS plug-in and click Restore to turn it on.