From AVOne:

AVOne 3GP Video Converter, a versatile 3GP/ 3G2 converter, can support all mobile phone video formats including 3GP, 3G2 (3GPP2) and MPEG-4. The 3GP Converter can not only convert video files like DVD, AVI, MPEG, MOV, WMV, RM and rmvb to 3GP, 3G2, and MPEG-4, but also convert 3GP video file to video formats such as 3GP to AVI, 3GP to MPEG, 3GP to Divx. So with the converter, rip dvd to 3GP format, you can convert avi to 3gp, mpeg to 3gp, rm to 3gp, rmvb to 3gp, wmv to 3gp, mov to 3pg. Convert dvd to avi, convert dvd to mpeg.