How to change the ringtone of Apple's cell phone, I see all the default ones!

Here is an example of how to change the ringtone of a text message on an iPhone 7, as follows:

First of all, click on the "Settings" icon on the desktop of your cell phone, as shown in the picture.

Second, then in the phone's settings interface, select the "sound" option, as shown in the figure.

3, then in the sound interface to open the "SMS ringtone" to enter, as shown in the figure.

Four, after entering, you can choose to set the type of SMS ringtone, here to "classic" as an example, click to enter.

Fifth, after entering the SMS ringtone can be selected to set.