Where is the announcement of Apple 7plus?

1) We open the settings in the mobile phone desktop and find the sound below the settings. Then there will be many options in the sound. We click on the SMS ringtone.

2) Then we can choose the ringtone of the system, for example, we can click our favorite SMS ringtone.

Friendly reminder: the ringtone setting of iphone6 is completed here. Of course, if you set it in other ios, you can also set it like this, as long as it is a mobile phone above ios7.