My 4S display definitely has a yellow look to it, and it's quite clear when I have it side-by-side with my old 4. I read that the yellow can go away in time, that it burns away the glue, which means to me that the display has a sort of manufacturing defect. Others have said the display is simply color calibrated more towards yellow while the 4 is calibrated more towards blue. Well, I do see the blue tint in the 4, and the yellow in the 4S. I prefer the blue tint look, it also makes the gray look more "natural" in my opinion. If the yellow is an indicator of defectiveness then I will return it, and I will I will get a brand-new 4S as it's within the 14 days of purchase. I wouldn't want a re-manufactured one. If the yellow is just a calibration issue, how can I calibrate it towards more blue? I rather not deal with the hassle of returning it if it's not defective, and I may get used to the yellow tint. So does yellow mean defective? Thanks for any info, feedback, or opinion on this!