"Start with this book if you want to understand the broadest social and technological impacts of the mobile phone. Although focused on the keitai in Japanese society, the authors provide a conceptual toolkit for examining the effects of emerging communication practices across the boundaries of nationality and discipline. This is not just about a technology or the way it is used in one country. It's about understanding one of the most important ways that twenty-first century lives will differ from those of the twentieth century."
--Howard Rheingold, author of The Virtual Community and Smart Mobs: The Next Social Revolution