With higher resolution cameras in mobile phones, 3GP format is getting more popular. Mobile 3GP Converter is a freeware which can convert 3GP videos to AVI format using 3GPtoRawAVI converter. The 3GP video files must have audio in order to be converted.
The program is pretty simple to use and there are 2 modes of conversion, one is single file conversion and other one for multiple files. Single mode conversion has the advantage of converting only audio, only video or both included.