If you want to play VOB movies on your iPhone 4, you can convert VOB to iPhone 4 friendly format with this professional VOB to iPhone 4 Converter - Free download.
VOB to iPhone 4 Converter - Best iPhone 4 Mate
VOB to iPhone 4 Converter gives iPhone 4 users an excellent solution in converting DVD(.vob) videos to iPhone of all models. With high tech involved, this free VOB to iPhone converter can be capable of meeting any customers' needs of doing such a MKV to iPhone 4 conversion fast and easily.
This VOB to iPhone 4 software enables users to convert any popular HD/SD Videos like AVI, DivX, Xvid, MPEG, MP4, MOV, MKV, WMV, VOB, TiVo recordings, M2TS, MTS, MOD, TOD to iPhone/iPhone 4 compatible formats easily and quickly.
Furthermore, powerful VOB to iPhone 4 can also be used as an iPhone 4 Ringtone maker by choosing the output format as “iPhone” > “iPhone Ringtones (*.m4r)” .
Free download VOB to iPhone 4 Converter supported, 100% Clean: No Viruses, No Spyware, No Adware.
Guide: How to convert VOB Video to iPhone 4 simply
Preparation:Download and install the Video to iPhone Converter, ready for the conversion.
Add VOB files to VOB to iPhone 4 software - Click "Add" button to import local VOB files or directly drag and drop VOB Videos to the program. batch conversion supported.

you can take a snapshot your favorite pictures while preview the input video.
Select iPhone 4 preset from format list and Set the output path: click on the “Format” bar, find iPhone group and select desired output format from the profile list like iPhone 4 (* .mp4), and the resulting movie looks quite nice on iPhone 4's screen.
Under "Output" option, specify an output folder to save converted files from VOB to iPhone 4

Edit input files (optional)- powerful VOB to iPhone Converter can edit input videos such as trim the video length, crop the video playing area, adjust the video Effect (brightness, contrast and saturation), merge files into one, and add watermark, replace the original audio with other music and sounds file, etc.

Convert VOB to iPhone 4- Make sure that you have checked the files you want to convert, and then click "Convert" button to start converting VOB to iPhone 4 compatible format.
When the conversion completes you may click “Open” button to find generated MP4/ MOV files and transfer movie to iPhone 4 with iTunes. Then you can play VOB files on iPhone 4, iPhone 3GS, iPhone 3G and enjoy it any time you like!