I am currently reading my way through a long list of science fiction and fantasy titles. (http://www.npr.org/2011/08/07/138938145/science-fiction-and-fantasy-finalists if you are interested in the list).
I realize that when this book was written, mobile phones weren't really a thing.
Although it is set in our future, it is already desperately out of date. So much of the tension is created around trying to locate people or waiting for phone calls. Things easily fixed through a quick text message.
Despite that, it is a very good book.