Can iphone4/4s/4S ringtone SMS volume be adjusted separately? What's the use of setting buttons in the voice? ...

There are only three volumes in the iPhone:

1. The call volume can only be adjusted with the "+"-"key after the phone is connected, and cannot be adjusted elsewhere.

2. The ringtone of incoming call, SMS ringtone and system notification reminder ringtone can only be adjusted together and cannot be separated.

3. The volume of the media, the volume of watching movies and listening to songs, can only be adjusted by the volume "+"-".

If the button in the settings is turned on, pressing the volume "+"-"button will adjust the volume of the media and the volume of incoming call ringtones and SMS ringtones, so it is best to turn off this function.

I hope my answer is helpful to you!