Convert MPEG-4 to 3GP

Hi,
Please help me with some software to convert MPEG-4 video file to 3GP. I have tried a few, but none of them supports such conversion.

Final Cut Pro can convert a file to 3Gp.
Apple.com

All of them are very absorbing
Thanks for all of you!
but seems imtoo are more grateful here

But are there any freeware ones?

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You can edit your MP4 video with iMovie and export as 3GP video. The best free solution.

Multimedia Editing and Converting App: Video Converter, DVD Ripper and iMedia Converter for Mac.

I am using Nidesoft mp4 vido converter.It helps you convert MP4 to MP3, AVI to MP4, MPEG to MP4, WMV to MP4 video easily and fast with simple settings.
U can link here:
www(.)nidesoft(.)com/mp4-video-converter(.)html

you should use E.M. HD Video Converter, you can “Converting all videos to HD Video
Convert video and AVCHD to DVD, DivX DVD
Create Blu-ray Folder for PS3 and Blu-ray Player”

Work well on my computer, i like it.
You can search this software from here:
http://www.google.com/search?hl=en&q=E.M.+HD+Video+Converter&btnG=Google+Search&aq=o&oq=
http://www.effectmatrix.com/hd-video-converter/index.htm
Hope it can help you.

Another good choice could be Wondershare 3GP Video Converter