How to create a custom ringtone on your iPhone | Apple Support
If it is not visible in the main list, scroll to the bottom and tap . Select Opening to set it as your default. Key Ringtones in iPhone History
The default for the iPhone 7 and iOS 7 through iOS 10.
The first iconic default ringtone introduced by Steve Jobs.
Introduced with the iPhone X and remains the current default. Downloading the Original Tone