An iPod Touch fan write to me about this problem, and I make this guide for the iPod Touch fans like him who encountered the same question.
Question: How can I watch DVD on my iPhone?
Answer: You need a DVD to iPhone Ripper to convert your DVD movie to iPhone MPEG4 format.
This guide can tell you how to transfer DVD movie to iPhone with DVD to iPhone Ripper!
Software: iOrgSoft DVD to iPhone Converter
Main Function: Convert DVD to iPhone format and transfer DVD movie to iPhone
Buy DVD to iPhone Ripper $29.95
Free Download DVD to iPhone Ripper
Step 1: Import DVD files
There are four methods for you load DVD files. Click
icon, you can directly import DVD folder. Or Click green arrow next to “Add” icon, you can import DVD files from a drop-down list: Load DVD Folder, Load IFO File or E:\.

Step 2: Output Settings
You can set the output settings for the selected file in the following area.

Click
button, you can do the advanced video and audio settings. Video encoding settings include video resolution, frame rate, encoder, and bit rate. And audio encoding settings include sample rate, channel, encoder and bit rate.

Step 3: Start to Convert
When all the necessary settings and editing are set OK, just click
the button to begin converting your DVD file.
You can check "Shut down your PC when conversion finished", the software will automatically shut down your computer after the conversion is completed when you leave.
Check "Open output folder when conversion finished", when the conversion is completed, the output folder will be opened automatically.

OK. You transfer DVD movie to iPhone with DVD to iPhone Ripper successfully.
DVD to iPhone Ripper is a popular and powerful program for iPhone users. iOrgSoft DVD to iPhone Converter enalbes you to rip any DVD movies without region code limitation. It can rip DVD to specific iPhone MP4, iPhone H.264/MPEG-4 video format for playback on iPhone, iPhone 3G. Besides, it also allows you to rip DVD audio to MP3, M4A, and WAV format. DVD to iPhone Converter offers powerful editing features displayed on an intuitive interface. You can select any favorite part of DVD movie for conversion using “Trim” function. Oppositely, you can join several DVD chapters or titles into one file provided tick the "Merge into one file" option. iOrgSoft DVD to iPhone Converter offers other rich options such as DVD video crop, special effect setting, subtitle and audio track selection, etc.
Just download DVD to iPhone Ripper to transfer DVD movie to iPhone and enjoy them anywhere and anyway.
Buy DVD to iPhone Ripper $29.95
Free Download DVD to iPhone Ripper