Interesting idea, but not very practical, I’d say. The pages all have a  weirdly shaped hole in them, and although they’ve left a space for a headphone cord, you can’t turn the page without having to thread the cord through the hole or take the phone out. Surely there’s a better way to make a notebook that will hold a phone inside.

 

See more at Smartphone Notebook 2 for iPhone 4/4S: Unexpectedly Useful? – Technabob.