Specific steps
The 1.ios7 interface and the IOS6 have changed a lot, but the features are not very different, we are in the iphone "Settings" application, as shown in the picture
2. Then we find the "sound" option, click Enter, as shown in the picture
3. Here we click on the "Phone ring" option to enter, as shown in the picture
4. Then you can see the new iOS7 phone ring, as shown in the picture
5. We can click on the "Classic ringtones" option.
6. I believe that the "Marlin Ma Qin" This ring is the most familiar, if you want to choose the previous ringtone, you can choose here, as shown in the picture
7. For other such as SMS ringtones, mail, calendar reminders can be set according to this method.
If you are not interested in the system ringtone, we can try to use itunes to make ringtones.
Friendly Tips
As long as your iphone is iOS7 system can refer to this method to set up the phone ringtone, here I will not give you the students to introduce you can set.