So I just got my wife the S3. She is on a limited data plan (aren't we all). She used it for a day and after the first hour, her data usage was nearly 215 mb, all from the GALLERY app! We turned off G+ Instant Upload (had it on wifi only anyway). And we turned off picasa and Google Photo sync. Anything else? THere are NO settings in the gallery app to sync on wifi only like there is on the Nexus. I think turning off photo sync should fix it, but she was on a 200mb plan and went through it all in an hour because of this.