Many users of iPhone 4 running iOS 4.2.1 reports that a blue tint appears in the center of the pictures those are white. While some iPhone 4 users reports that the blue tint appear in the center of picture only in the presence of fluorescent lighting and some other iPhone users reports that the blue tint appear only when using the flash.
Well, This blue spot camera bug has been fixed in Verizon iPhone 4 running iOS 4.2.6. This indicates that this blue spot camera bug will be fixed in iOS 4.3. We have to wait until the release of iOS 4.3 to see whether blue spot camera bug is fixed in iOS 4.3 or not.