1. download and install the synchronization assistant, and Baidu can search it. I downloaded the V1.32beta version

2. connect your iphone, double-click the ringtone under the device, and then delete the ringtone.

at this time, you will find that the customized ringtones that have been deleted synchronously but are still on the mobile phone are gone.

3. If you want to continue to customize ringtones, first delete all ringtones in the itunes library, add them again, and then synchronize again. When I synchronize, I choose the selected ringtone, not all ringtones. But in the drop-down box of the selected ringtone, you can check all of them.

according to the above steps, after my synchronization is deleted, the problem that stubborn ringtones are still reserved on my mobile phone has been completely solved. I hope I can help you! ：））