Take Apple 5s for example:
1. We can search for "apple ringtones" or "cool tones" to find someone else to make a good ringtone.
2. Then we connect the iphone to itunes and then use itunes to import the ringtone into the iphone.
3. We click on the menu bar in the itunes interface shown in the picture, edit-preferences-check ringtones-ok
4. Then click My iphone-app in itunes-drag down the page-select application-cool tone ringtones
5. Then we put the prepared bell on the computer desktop, of course, can also be placed in other places as long as you remember to live in the location.
6. Then we drag the prepared m4r ringtones file directly to the itunes repository
7. Then in itunes we click on the top of my iphone– menu-Select the ringtone specific steps as shown in the figure.
8. In the final step, we click on "Sync Ringtones" as shown in the picture.
9. Then we then right-click My iphone– sync in the itunes interface and start synchronizing the ringtones in the database to the iphone
10. The final step, the ringtone synchronized to the iphone5s after we click on the settings in the 5s-sound-settings can be set up just the ring you want to call the bell Oh.