THIS CHAPTER WILL EXPLORE the iPhone device with an emphasis on the technologies and hardware that define the iPhone user experience, such as the multi-touch display, motion sensors, and location information. In addition to explaining what’s possible with the device, this chapter will provide best practices based on recognized usability principles and Apple’s iPhone Human Interface Guidelines. Following these best practices will make your app easier to use and may expedite its approval in the App Store. At the conclusion of this chapter, you will understand how the iPhone’s features can improve the user experience of your app. You may also be inspired to explore and combine these features in innovative ways.