It is possible to read books on the iPhone 4 with iBooks software and add PDFs to iBooks without any synchronization in a few simple steps. Before adding the files, it is important to install the ibooks on your iphone. iBooks is available for free download. Once iBooks is installed, add files to iPhones by using the synchronization system Dropbox. Now, it is possible to add PDFs to iBooks without any synchronization. Just create a new directory and add files to Dropbox. From the iPhone, open the PDF and when asked enter iBooks as the program to open the PDF with. The new generation of telephony is here!