While you can’t purchase brand new books through the app, it can read so any e-books you do buy and download onto your computer could be transferred over.
It is a simple eBook reader for the iPhone which supports HTML and text files stored in your Media/EBooks folder, and is smart enough to enter subdirectories.
Well, this is an awesome application indeed. But be careful, as this is unauthorized by Apple. Damage or any adverse effects it has on your iPhone will be your own fault.
For more information check our reference.