3gp Video Kates Playground I Recorded .3gp Video In Vertical Position In Mobile SE K800i But In My Computer Its Horizontal, How To Fix It

I recorded .3gp video in vertical position in mobile SE K800i but in my computer its horizontal, how to fix it - 3gp video kates playground

I took gp 3 video and vertically on the phone (SE K800i), but when I transfer files to my computer, the horizontal position, as I rotate the video, what software?