The iPhone rose to prominence on the idea that it was an all-in-one device that allowed users to access many forms of media right from the handheld. And since its inception this functionality has made the iPhone one of the most popular smartphones in the world. Evidence of this popularity can also be seen in the App Store, which is another runaway success that deliver apps and media to the iPhone user. But while the software has never been lacking as far as the iPhone is concerned, the company has had less success with hardware add-ons.