Can’t delete custom ringtones from iPhone or iPad? Try Garageband. Your custom ringtones made by Garagaband can’t be deleted using iTunes or other third party tools.
Run Garagaband app on your iPhone or iPad. Once the Garagaband opens on your iOS device, all your songs will be listed as thumbnails. Long press on any song to select it. It doesn’t matter which one you choose here. After that then tap the Share button on the top right corner and choose Ringtone from the drop-down menu. See below screenshot.
The “Export Ringtone” screen opens. At the lower section of the ringtone export dialogue, you can tap “Your Ringtones” to find all existing ringtones you have created using Garageband on your iPhone or iPad. Hit Edit, then you should see the red minus, which you can tap to delete the custom ringtones from iPhone iPad using Garageband.
Doing this will remove the tones from both Garageband and iPhone or iPad Settings. Alternatively you can also swipe to delete on any ringtones you don’t want anymore from the “Export ringtone” window in Garageband.