What is 3gp?

3gp is the codec your multimedia mobile phone uses to record and play videos on your mobile. So if you make a video on your phone it will be in 3gp and the same if you download something off your mobile internet.

What do i need?

A multimedia mobile phone with some way of connecting it to your computer (a cable, Bluetooth) and enough free space on your phone for the video.

What do i do with the files?

Download the files to your computer (right click save as) then plug in your phone to the computer. Your phone should appear as an external drive in 'My computer', look in there for a file labled video (it is often in a folder called media). Drag and drop or copy and paste the downloaded video into this folder. The video should now be in with your other videos. You may have to unplug the phone from the computer before you can see it on your phone

I havn't tested this with all makes of phone yet but i know it works for Sony Ericsson and Nokia