Looking for Free ringtones on the web I found Audiko which also provides MP3 ring tones and free iphone ringtones for download.
There are various ways to create iphone custom ringtones using Iphone application like Iphone custom ringtone maker & converter for iphone ringtone but if you are looking for ready made iphone ringtones then Audiko would be much more helpful!
Basically Audiko lets you download pre made ringtones easily from there database. It has 100’s of popular ringtone songs converted into mp3 format and also iphone compatible form. Navigate to Audiko and search for your favorite artist or song,Incase if you don’t know the song title or Artist name then check this post. Now after finiding the right song, download it in the form of ringtone for Iphone. For other mobile devices you can download the music in mp3 format.After downloading just add the file to iTunes Ringtones library. Next time when you will sync your Apple Iphone 3G you will find the ringtone installed!