Getting good fireworks photos is a challenge on any camera. Fortunately, Apple has continued to improve the cameras in the iPhone, and some features will help you get impressive fireworks images.
When photographing fireworks, your big issues are camera movement and focus. If you have a tripod like the Joby GorillaPod, use it. If not, steady the camera on a car roof or some other stationary object.
On to the focus issue. Apple's tap to focus feature can help you get well-focused images. You'll have to be quick, but if can tap the screen as the bright fireworks display appears, your camera will focus quickly and properly. Even better, both iOS 5 and iOS 6 have a