How to send full quality videos through iMessage?

I have an iPhone 5 with iOS 7.0.4.Im filming a project and other people with iPhone 4's sent me videos they recorded through iMessage on 3G and the videos came out grainy and bad. How can I revive their videos in full quality. Only one out of the 4 videos came out good. Could it be because they sent it using their data. Will sending it through Wi-Fi to iMessage help? What can I do to receive their videos in full quality?

Have them send it by email. IMessage may compress the video at some point, while attaching it to an email will not.

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