Why is there a sound in the incoming call of iphone4s and no sound in the SMS?

The reason why iphone4s has a voice when calling and no voice when texting is because the voice of SMS is independent. After mute is set, there is no sound when the text message comes in.

The steps for setting SMS sound are as follows:

First, point setting;

Second, notice;

Third, integral information;

Four, when the "license notice" is in the open state, it is possible to make a sound;

5. Click on "Notification Sound" and select "Reminder Ring" of SMS. The top one is "none", which means that there is no sound when the text message comes, and everything else is audible.