Hi. I have compared my iPhone 4 with my brothers which we bought at the same time. It seem that his phone has a yellowish tint, while mine is generally more purple. This is much more apparent on a white screen. Do we have a problem with our phones? I have read that the yellow is the defective color, but my own phone's purple hue is also a bit off putting. I thought an iPhone 4 would have a very white white. I had no idea it was yellow or purple, until compared with my brothers. So does anyone else have a comparison or know of this problem? Thanks.