This is a free software, you can convert many file with this software.
Other file to 3gp
Dat – 3gp
Mpg – 3gp
Flv – 3gp
Avi – 3gp
Mp4 – 3gp
3gp to other file
3gp – Mp4
3gp – Mp3 (audio)
3gp – Avi

» Read more: Download Free 3GP Video Converter 3.1.1.3