How to download large video to iPhone?

I took a video earlier today and I sent it to my mom's iPhone. I guess the file was too large and it's not letting her save the video to her camera roll like it should. How do we manage to save the video to her camera roll.

Iphone supports video format like avi and mp4. You can download a video converter to burn your video into the right video format, and change ite size, then you can play it on iphone.

As to the video converter, you can try "format factory", it is free and useful. If you want to use other professional video converters, the websites, such as goshareware, cnet, sfotpedia, supply for these software.