Question: how to set a purchased song as a ringtone on iphone x?
Answer: On your iPhone X, open the Settings app; Now scroll down to Sound & Haptics; Once again, scroll down to the section called 'Sound and Vibration Patterns'. Tap on 'Ringtone'; Now tap on 'Tone Store'; You'll now open the iTunes Tone store where you can buy and download new ringtones.