What can I use to convert 3gp to a usable format?

i'm using ulead videostudio, trying to put together videos of a concert I went to. What can I use to convert the 3gp files (it was on my cell phone) to a usable format? I need it to be free and easy to use. Thanks!
you can download a converter for the computer, I would Recommend ABC3gp converter it has 3 different conversions that one of them is MP4 which can be played on windows media player.

Learn different compression of MPEG and choose the best tool.

try Cucusoft DVD Video Converters Suite. This package includes DVD Converter and Video Converter. Convert DVDs and videos to play on almost any portable device including iPod, iPhone, Zune, PSP, video capable MP3 players, mobile phones etc. I'd like to share this brillant program below:

The popular ways to play h.264 video after you have converterd DVD to H.264 or other video to h.264.

Also, you can google some other software:
topsreviews
You can use uSeesoft Total Video Converter to have a try.
It can convert 3GP to other formats.
useesoft
If you have trouble in using it, you can visit here:
wikihow
Source(s):
You can visit
to learn more useful rippers or converters.
Hey!!!
This programm is what i call light and simple. Moreover, it was free when i donwloaded it.

Video knowledge center provides information about videos as much as possible for your reference, including video formats, video codecs, video playing, video conversion.

there is also a guide there, as you can see.
I think it may be useful for u and you'll make a good video of the concert. Good luck *_*