Currently Being ModeratedFeb 23, 2014 10:07 AM (in response to Dgdejavu)
From a previous answer to this question:
Buy one from the iTunes Store and install it, or create one yourself and sync from iTunes.
https://discussions.apple.com/message/17777381 - making a ringtone
Getting ringtones folder to show in iTunes -https://discussions.apple.com/thread/2629494 - iTunes > Preferences. Under the General tab below Show, confirm Ringtones is selected
How to sync ringtones to your iPhone -https://discussions.apple.com/docs/DOC-3792
There's lots of other information on this out there, Google: "add ringtone to iphone "