In this chapter, I will focus on the transformation of the Japanese family-in particular how parent-child relationships are mediated by the use of mobile media. Some may question how this topic-which focuses specifi cally on mobile media in Japan-is relevant to a global audience. It is important to recognize that the rise of global mobile media is framed by the forces of the local. To gain acuity on the trends of mobile media adoption and adaptation we must understand that technologies do not exist in a vacuum and that the process of technological adoption is part of a dynamic social process. Through the lens of the keitai1 we can gain insight into the complex and dynamic relationship between technology and society.