For those who want more information regarding my earlier post about copying deck files to or from the iPhone version of Decked Builder using iTunes while connected via USB, please check out this informative article from Apple:
http://support.apple.com/kb/HT4094
The article is for the iPad, but it is equally applicable to all iOS devices, including the iPhone and iPod Touch.
Decked Builder is unofficial and is not affiliated with, endorsed, sponsored, or approved by Wizards of the Coast. Magic: The Gathering is a trademark of Wizards of the Coast LLC.