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If you’ve constructed a ringtone, you have only one choice for exporting it: choose Share > Send Ringtone to iTunes. iTunes opens and plays your new ringtone. Notice that the ringtone is stored in your iTunes Library in the Ringtones category. The next time you attach your iPhone to your Mac, you can select the iPhone in the iTunes sidebar and then configure copying the ringtone to the phone through the Ringtones pane in iTunes.
Once you’ve synced the ringtone to your iPhone, in the Settings app on the iPhone, tap Settings > Sounds > Ringtone. Any ringtones you’ve created will be at the top, in the Custom category.