I only know of one way to make the volume louder. I downloaded an app from the app store called myxer (no affiliation.) it's a ringtone maker that let's you use your iPod music to make ringtones. After you cut a part of a song and email it to yourself through the app, you get on your computer and transfer it to iTunes (the app has better instructions on how to do this), and once you set one of these ringtones on your phone, you'll notice a major volume difference between the stock ringtones and these custom ones (or I did at least). Hope this helps!