After reading the books, I continue to build a set of mobile application for Nokia and Samsung phones at http://www.doitech.com/default_files/super.htm The books provides many useful tips, that has shorten my development time. I found some things to be needlessly verbose, and I wish there were better summaries of objects and inheritance between the required classes, but all in all, it easily provides the foundation needed to create, debug, and test almost any J2ME mobile phone application around. I would recommend this book for all developers as a reference book. One of the authors, Yuan, wrote a book on J2ME recently, and you may perhaps consider this Nokia book as somewhat of a sequel. If you're already facile in regular Java, transitioning to this book should be easy. Another difference shown by the book is that there is now often an emphasis on audio and video capture and playing. The authors and Nokia have produced a very cleanly laid out and logical presentation.