Hi JudJer, First I would say to make a couple of copies of the video file, and save them away somewhere on your pc. If it goes wrong you'll need the original again.
Can you say what file type the phone records in? (I'm guessing .mov?)
Also can you say what you want the DVD to play on, a PC or a DVD player?
You may need to convert the file first, as 'tipstir' mentioned, but be aware that some conversions make files that are far greater than the original and .avi is one.
In this case your video is 3.52 GB and a DVD has a limit of 4.7GB.
Some files when converted will end up four times larger than the original, so burning it to a DVD won't be possible.
If you want to share the video on DVD it might be easiest just to copy the file to DVD as a .mov file and let the other viewers use their own Quicktime player, on a laptop or destop.