i have just got a new phone and supports 3gp format, so i need a software which can convert various video formats like mp4, mpg, avi, divx, xvid, vob etc to 3gp.
http://www.koyotesoft.com/ download the software you want its available on the left side of web page. video converter is the best, i hav been using it since 1 year, no issues.