Is there a way to remove custom ringtones from an iPhone without using a Mac or PC?
Follow these steps:


Press Select.
Choose any of your recordings, it doesn’t matter.
Press the button of the box with an arrow pointing up in the bottom left corner.
Press the Ringtone button.
Press Your Ringtones.
Slide left the ringtone(s) you want to delete, and there should be a Delete button.