I was able to convert DVD to iPhone using the Cucusoft iPhone Video Converter suite software I found on http://www.welldownload.com/dvd-to-iphon.html  So far, I'm really impressed with how easy it is to use and how effectively it got the job done.
1.Download the latest version http://www.welldownload.com/dvd-to-iphon.html  ,and install it. You can know more about it by referring here.



2.Insert the DVD you'd like to convert to your computer's DVD drive.



3. Click 'File' menu and 'Open DVD', or directly hit 'Open DVD' button to load the DVD. Set the profile to be iPhone 480*320 mpeg-4 video which is the default DVD video quality.
4. Click around in the DVD's menu to set up DVD playback as you like, select the subtitle and audio sound tracks etc, then begin to play the movie through the software by click the play button.
5. The following window will pop up. Here, you can rename 'Title Name', set 'Save Path' and output quality, then click 'Yes' button to start ripping DVD to iPhone MP4 or iPhone H264 video from the point that the movie starts. That is all. Just so easy!