Has anyone had this problem? I received a movie file of type .mov on my iPhone 4s as an attachment in e-mail. It was made on another iPhone 4s but I can't get it to play or move it to my camera roll. When i click on it it shows a black screen that says "loading..." for about 1 second and then goes back to the e-mail view that I clicked on. Since it was made and came from another iPhone 4s it should be in the proper .mov format.
It turns out that this problem was due to the .mov file that went to the iPhone somehow got corrupted. The same copy that went to my computer was fine. I have since tried other .mov files on the iPhone and they work fine.