Changing app alert tones is a great way to help you distinguish between notifications on your iPhone. You'll know if you're receiving a text or an email without taking your iPhone out of your pocket.

Unless you are using a beta version of iOS 5, there isn't an easy way to change the e-mail alert tone on your iPhone. I found a way that doesn't cost anything or require you to jailbreak your phone.

The FCC points out that using such tones is prohibited outside of emergencies, adding that it was a serious public safety concern. "These rules aim to protect the integrity of the alert system by ...