Those phones use .3p2 or something like that. Its some really weird Verizon phone format as far as I could tell, because I had never seen it before. On my Nokia, the video would play but with no sound. On my sister's old non-Verizon LG, the videos wouldn't appear period. Maybe they would work on my RAZR V3, but it has such little memory (8 MB), and transfers files at 5 kB a second, so it takes days to do anything.
I've also tried converting them to MP4 or something more standard, but not even the file converter recognized the sound format, since the video converted, but once again, with no sound. There has to be a way, but I haven't found it out.