pervy bastardIt's a piece of piss assuming you can get the file to open in something like VirtualDub. The trick is getting it to open in VirtualDub. I have tried using Avisynth but it doesn't play nice with 3gp so you might have to convert with something like the snappily named Free 3GP Video Converter
and then drag it into VDub and then apply the rotate filter and encode to avi through xvid or something. If it's not massive you can email it to me and I can run it through for you, I have it all set up.