The supported video formats which you can play on your phone are: H.263, H.264, MPEG4-SP. This means that if you want to play a video file, you need to encode it using the codecs mentioned above and use a recognized file format. Also, as the phone's internal storage is limited to 55 MB, 64 MB RAM, 128 MB ROM you need to have a microSD card attached to the phone where you can copy your content.
