How to put a PDF file onto an iPhone 4?

Preferably not having to view it on an email…

Syncing and saving PDFs

To add PDFs to your iTunes library on your computer, simply drag and drop the PDF into your iTunes Book library.

To sync a PDF to iBooks on your device:

Select your iPhone, iPad, or iPod touch in the Devices list on the left in iTunes 10.1 or later.
Click the Books tab in the resulting window.
Ensure that the Sync Books checkbox is enabled.
If iTunes is set to only sync selected books, be sure to enable the checkbox next to the PDF you want to sync.
Click Sync.

First install kindle app on iphone. Connect to your system, after connecting your device open itunes->click on your device on left menu->go to apps->under the applications you can see the file transfer tab->choose your pdf file and transfer it.

Use some iPhone transfer tool to transfer PDF to iPhone
it have a same use with a USB

You can put the pdf to your iPhone via iTunes, and view a pdf with iBooks, both are free apps from Apple.

And this article shows detailed steps, http://blog.anypdf.net/useful-info/easily-transfer-pdfs-to-ipad-2-iphone-and-ipod.html

you can read for reference.

PDF to EPUB Converter is a standalone and efficient desktop application to convert eBooks from PDF to EPUB format. You can check the output EPUB eBooks with Adobe Digital Editions on your PC and transfer them to your iPad, iPhone, iTouch, etc. To enjoy reading on the go.

Try PDF to ePub converter yourself
Learn more details from http://www.ws-pdf.com/pdf-to-epub-converter.html

Hope it helps

Using iTunes for transfer files from PC to your iPhone 4.

There are some apps can transfer PDFs to mobile devices, also follow this PDF to iPhone user guide.

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