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The video works fine, but theres no audio on 3gp files in VLC, the latest version just released.

Does anyone know what to do to make the sound work in it?

VLC does NOT support all the possible varieties 3GPP file formats.

The video works fine, but theres no audio on 3gp files in VLC, the latest version just released.

Does anyone know what to do to make the sound work in it?

If the audio in your file is amr(nb or wb) you probably have to compile vlc by yourself.

http://wiki.videolan.org/Common_Problems#AMR
AMR
To use AMR, you'll need to compile vlc and ffmpeg with amr support yourself. This is because the amr license is not compatible with the vlc license.

Look here http://www.videolan.org/developers/vlc.html for compiling HOWTOS. You will find information what you have to do for amr support in the FFmpeg configure script. Search for AMR_WB=yes and AMR_NB=yes and you will get two links to extra source which is needed.