How does IPHONE4S turn off SMS and make a sound? It should be off in the settings, but there is still sound.

SMS sound setting method is as follows:

First, go to "Settings" on the desktop;

Second, enter the "Notice" below the settings;

Third, enter the "information" below the notice;

4. Turn off the Permit Notice or select "None" as the following "Notification Sound" and "None" as the vibration.