Why do you want to open the SMS settings?

A junk service, it is recommended to close; I used to turn it on, and then I often received spam messages.

Consult the salesman. They asked me to turn off the service information settings in the SMS settings.

And turning it off won't make any difference. There are different ways to turn off the phone. Generally in WAP browser, there is a setting. In the settings, there is an option whether to accept service information. Turn this off.