The bug, which affects both devices in different ways, shows the same symptoms. Users who get horrible battery life and decreased signal strength, especially when using the international version on a U.S. carrier, could have the bug. With the Galaxy S II solution being to simply disable it, users who bought the international version of the SGS3 for use on AT&T in the U.S. have a different solution. XDA Senior Member cmd512 has released a method that aims to fix the data speed problems and perhaps the battery life problems as well. According to cmd512:
I realized that the UK version of the GT-I9300 does not have ANY Fastdormancy data for AT&T medianet. So, I added them in, and now, I’m pulling consistent 5Mbps downloads vs not being able to break 3Mbps previously.
So, as opposed to simply disabling it, the solution appears to be to simply add information for AT&T MEdia Net. There are two ways to get it done. There’s easy way, which requires users to download a file with all the modifications and switch out the unmodified one. And then there’s the fun way—where users use SQLite Editor and their favorite root explorer to do it manually. Whichever way is used, the end result is the same. Users should be able to achieve better battery life and data speeds.