How to change the ringtone on iPhone, iPad, or iPod touch
Apple has a good selection of ringtones for the iPhone, but even they can get old. Here's how to change your ringtone with either one you've bought from Apple or made for yourself, as well as how to set specific ringtones for individual contacts. It happens to most of us at one point or another — ringtone fatigue. Fortunately, it's easy enough to switch your ringtone whenever you want, and it only takes a few seconds. How to change the ringtone on your iPhone Open Tap Done Tip: This isn't just for the iPhone, either. You can also set ringtones for the iPad and the iPod touch.
Source: appleinsider.com