Simple Guide:
Free download this powerful AVI to iPhone 3G converter to your PC, lauch it.
Add "AVI" files by clicking the button
.

Set output format as "iPhone 3G" from the Profile combox, then select a folder to save the export file from the Destination option.
Note: Advanced settings can be ajusted by clicking the button "Settings" next to the Profile option.
Customize the export file in the Video Edit window by clicking the button "effect", in which you are able to adjust effect, trim segments and crop area size.
Check the item
if you want to merge the selected files into one.
Click the button
to start converting.
Little of your time may be consumed, then it's time for you to enjoy the newly converted movies on your iPhone anytime anywher! Just try!