How can I set custom ringtone for a single contact?
I want to set different ringtones for the most frequent callers, so I can identify the caller just by hearing how my phone rings.
Open the Phone app. It's on your phone's home screen, and has a phone icon. Tap Contacts. Tap on the contact you want to assign a specific ringtone to. Tap Edit. It is located in the upper-right corner. Tap Ringtone. Tap Add from device storage (optional). Tap the ringtone you'd like to set, Tap the back button.
Good luck....