For a phone that's supposed to be user-friendly the fact this book has 330 pages tells you how complicated it really is. In addition the book is printed in smaller than normal and very light type making hard to read. The type also goes so far into the gutter which adds to reading difficulty unless, perhaps, you break the spine and force the book to lie flat when reading it. Illustrations are clear and plentiful.
The book was too much to read from cover to cover so I approached it by topic using the index and found that helped with isolated problems but didn't really give a good overview of the phone's capabilities.
Best advice is don't buy iPhone 4s if you really just want to make phone and text calls and then you won't need the book. The instructions that come with the phone are extremely minimal...almost useless...probably to trick you into thinking it is so user friendly you won't need help using it.
Btw...you know all the little joke videos people email to you...the majority of them won't play at all on the iPhone as it won't accept Flash media...same with YouTube videos.