ArmHack

Free 3GP Video Converter. Convert 3GP video files recorded with your cell phone to more common PC video formats AVI or MP4 or back other video files to 3GP. Extract audio from 3GP video files.

Input file formats: *.avi, *.ivf, *.div, *.divx, *.ogv, *.mpg, *.mpeg, *.mpe, *.mp4, *.m4v, *.wmv, *.asf, *.mov, *.qt, *.ts, *.mts, *.m2t, *.m2ts, *.mod, *.tod, *.3gp2, *.3gpp, *.3gp, *.3g2, *.dvr-ms, *.vro, *.flv, *.amv, *.rm, *.rmm, *.rv, *.rmvb, *.mkv.

This free 3gp converter contains no spyware or adware. It's clearly free and absolutely safe to install and run

http://www.dvdvideosoft.com/products/dvd/Free-3GP-Video-Converter.htm