These are my two iPhone 3GS. The right is an 16GB white and the left is an 8GB black. They were bought at different times and only now have I compared them side by side and noticed the screen quality is better on the black than the white. Neither have had their screens replaced so I am wondering why they are so different. The brightness setting is identical however the right one is more blue than the other. The left one matching the colours and contrast of my 4s.