Tip - How to Use an MP4 File As a Ringtone for an iPhone | eHow

The Apple iPhone is a smartphone that was introduced in 2007. Among its features, the iPhone allows you to easily set custom ringtones. In addition to being able to pick and choose ringtones, you also can create your own ringtones using iTunes and your computer. Once you have created the ringtone, you can sync it to your iPhone and begin using it...