[Q.] Is there a way to save PDF files sent as e-mail attachments directly to my iPhone so I can read them without digging around the Mail app?
[A.] Apple’s App Store has a number of programs for PDF-related tasks, including the free Adobe Reader for iOS that allows you to view, download and save PDF files attached to your e-mail messages. If you simply want to copy a PDF file attachment to your phone for later reference and have already installed Apple’s iBooks app for reading electronic books, you do not need to get an additional program.
When you have a PDF file you want to save from an open Mail message, press and hold the attachment icon until a gray screen appears. You should see buttons to view the file in Quick Look (a screen preview mode), to open the PDF file in iBooks, or to open it in another PDF-capable app that you may have installed on your iPhone already.
If you select the “Open in iBooks” option, the PDF file is copied to iBooks and appears in the PDF section of the app’s virtual bookshelves, where you can tap it open and read it whenever you want. You can toggle between your different document collections in iBooks by tapping the Books/PDFs button at the top of the screen. If you sync your iPhone with your computer, saved PDF files are backed up to iTunes and available in the Books area of the program.