Here's how you can download a free iPhone user guide for iOS 6 in ebook or PDF format.
To download in PDF format:
1. You can download the guide in PDF format here.
To download in ebook form in the iBooks app on the iPhone:
1. Open the iBooks app and do a search for "iphone user guide"
To download it in ebook form via iTunes:
1. Go to the iPhone User Guide for iOS 6 download page in iTunes.
2. Click on the View in iTunes button.
3. In iTunes, click on the Free button to download the guide.
The iPhone User Guide contains much helpful information and it's totally free from Apple. So be sure to check it out.