Download itunes software
First, you need to download itunes software, and then import your favorite songs into it. Click "Music", then select "File" and easily add it to the library.
Making exclusive ringtones
Next, make your own ringtone. Select your favorite song, right-click, select "Show Introduction", and then enter "Options". Turn the volume to 100% and set the start and stop time you want (note that the ringtone of Apple mobile phone can only be set for 40 seconds). Everything is set, click OK.
Create ACC version
Then, create an ACC version of your ringtone, click the version, right-click and select "Show in windows Explorer". Finally, the song format was changed from "m4a" to "m4r".
Import itunes
Next, import the ringtone into itunes. According to the path: ringtone, file, add the file to the library, select the song and open it. Then, plug in the phone and select ringtone synchronization.
Set the bell
Finally, set the ringtone. Open "Settings", select "Sound", then enter "Ringtones", click "Customize" and select the ringtone you just made. You're done!