Apple iPhone 4 is really nice phone and lot of people using it. When you have your favorite phone then you must have your favorite ringtone on your iPhone. Instead of purchasing ringtones for iPhone 4 you can create free ringtones using iTunes from your favorite music files.
We already written an iPhone guide to create free ringtone using iTunes and this guide works on both Windows and Mac OS X. using the same method you can create ringtone for iPhone 4.
How to create ringtone for iPhone 4 Click Here