The book is an edited collection of social and cultural studies of keitai (mobile phone) and pager use over the past decade or so in Japan. We included our own research as well as research by a variety of mostly Japanese scholars whose work we translated from Japanese.
I've been reading an early copy, and I'll post a more thorough review as soon as I can, but — if mobile culture is of any interest to you, go buy this thing! It's a terrific, rich work — and a very readable read. Link