Digital copy of the movie won't go onto my iPhone

Digital copy of the movie won't go onto my iPhone help?

Drag the movie to iTunes library. Then sync iTune with the iPhone.

We assume: There's no copy protection on the "digital copy of the movie" and you iPhone has enough memory to hold the movie.

If your movie is already mp4 video, you can import the mp4 video into iTunes at first. Connect your iPhone to computer through USB cable, iTunes will recognize the iPhone automatically, and then go to iTunes menu 'File -> Sync iPhone', the video will be transferred to iPhone.
If your video is not iPhone compatible mp4 video, you can follow this step by step guide to convert and sync the video to your iPhone, it's easy to understand and works pretty well for me.
http://www.dvdtoiphone3gs.com/how-to-play-dvd-video-on-iphone.html