The iPhone is fully compatible w/ mp3 audio files. You'll need to connect your iPhone to a computer w/ iTunes... drop the mp3 file into iTunes... then sync your iPhone. The mp3 will then show up in your iPod app on your iPhone.Welcome to iPhoneForums.net!​ Here's a few links to check out and get you started... enjoy! Forum Rules | http://www.iphoneforums.net/forum/iphone-help-15/iphone-tips-20552/?highlight=tips+tricks | http://www.iphoneforums.net/forum/iphone-help-15/iphone-tips-tricks-8543/?highlight=tips+tricks | http://www.iphoneforums.net/forum/hacking-tutorials-guides-68/what-jailbreaking-15928/ | http://www.iphoneforums.net/forum/iphone-jailbreaking-17/thinking-jailbreaking-but-not-sure-13086/ | http://www.iphoneforums.net/forum/i...de-beginners-35540/?highlight=guide+unlocking | iPhone Mythbusting