How To Set Downloaded Ringtone In iPhone?

Open the Settings app

Tap Sounds & Haptics

Tap Ringtone

Select the downloaded ringtone from the list

If the ringtone is not listed, add it to your iPhone using GarageBand or iTunes/Finder first

Open Contacts if you want to set it for a specific person

Select the contact

Tap Edit

Tap Ringtone

Choose the downloaded ringtone

Tap Done