This book is worthless. As a .NET developer, I was expecting it to be a book on the .NET Mobile API, and catered to those developing .NET for the mobile community. NOTHING in this book that you cannot pick up in the QuickStarts. Nothing. It contains so little information that like one of the other reviewer, I'm ashamed I bought it too. Don't waste your time or money on this book unless you only want to have a high level intro on mobile devices and little sample code on how to do them in VB.NET - YUCK!