this applies to anything that relies on libjpeg (PHP/GD in my case).

For about a year, I just "accepted" the fact that pictures uploaded from cell phones
contained extraneous bytes, and there was nothing I could do about it... until I scoured
Google results and came across this fix:
http://www-personal.umd.umich.edu/~dennismv/corruptjpeg.html

The fix:
Find the following in jdmarker.c:
WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c);

Change to:
/* WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c); */

recompile libjpeg, recompile PHP/GD, restart Apache.

if you need the source again, go to http://www.ijg.org/files/