Deliver A Song

how to chang iPhone ringtone to popular song?

Hello, you can take a look at this guide about how to make ringtones for iphone using itunes:

http://www.softdiggs.com/howto/create-custom-iphone-3gs-ringtones-using-itunes.php

if it still fails to work, just get the iphone ringtone maker http://www.softdiggs.com/iphone-ringtone-maker.php
This piece of iphone ringtone creator software can turn virtually any music or sound source into iphone ringtones.

hope it helps!