I had the same problem. Some people claimed vlc would work, but it didn't. So I tried out this tool: http://grauonline.de/cmsimple2_6/en/...Repair_Utility
It worked when I gave it a reference video (video shot from the same phone), but it only saves half the video unless you buy the license. After watching the video, I determined that I don't need the second half for the price they ask (29 euros), but at least I got half. If the author would only charge say $5 per video I'd probably buy it. In lieu of that, I simply joined the file together to create one file twice as long and re-ran it. In windows "copy /b file + file combined_file". This worked as a stop-gap, but the sound got really off at the midpoint. So, if you really want it to work right, I'd suggest paying for the license.
Credit to this person for pointing me to the tool.