If you're looking for a book that focuses on just the most important, most useful, and most fun stuff about your iPhone 4--you've found it. There are basically two types of iPhone books out there: (1) The "tell-me-all-about-it" kind, which includes in-depth discussions on everything from wireless network protocols to advanced compression codes. (2) Then there's this book, which instead is a "show-me-how-to-do-it" book that skips all the confusing techno-jargon and just tells you, in plain, simple English, exactly how to use the iPhone features you want to use most.