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No two people are alike, and, in the same way, no two iOS devices are alike, as the information that one device stores is incredibly dependent on the person who uses it. We populate our devices with our lives, including our photos, calendars, notes, contacts, and music. As developers, it is incredibly important to be able to access all of this information regardless of the device, so that we may incorporate it into our applications and provide a more unique, user-specific interface. In this chapter, we will cover a variety of methods for dealing with user-based data, dealing first with the calendar, and then with the address book.