Here is a guide for novices not jailbroken or jailbroken.
You can still make your own ringtones very easily with this new version iTunes 10 and sync it with your iPhone.


Required :

• an iPhone.
• iTunes 10.0.
• an audio file in your music library of iTunes.

• Go to Music in your library.
• Right Clic on your musical file.
• Clic on Get some information then go to Options.
• Determine a sample of 20 to 25 seconds.
• OK.

• Right Clic on this file.
• Go to "Create an AAC version".
• A new file with the same name but different length is created and is located in your musical library.
• Right Clic on this file and then display the explorer.
• Copy this file and rename the extension of this file to .mp4r
• Then go back to your musical library and delete the file created just before.
• on the original file, go to Information – Options and uncheck "Start and End" to have it by default.

Note : With Windows Seven, open the explorer, go to Organise then Folder Options, and uncheck Hide the extension of known files.

• Import in iTunes this new file .mp4r located on your desktop.
• In your device on iTunes, go to Ringtones.
• Be sure that the new ringtone in iTunes is checked.
• Sync.

•  UnlimTones : make your own ringtones directly with your iDevice.