To all Iphone users, buy white, they seem to have a better screen compared to black most of the times.
Surprisingly & sadly Apple really went down on quality with iphone 4 S. It is not related to serial number & not even color however from my own experience white is better in terms of luck:p.
To share with you all my latest experience. I really could not tolerate my yellow screen, it is so frustrating especially that my wife's white 4S screen looks so nice so I sold my black iphone 4S cause we don't have refund or return policy in UAE. Thus for a 2 week old barely used phone I lost 150 $ from the 750$ i paid.
Now I went & bought another one which is white. Now Thank God I have a perfect screen but guess what:P
My wife's screen that was excellent compared to my yellow tint now looks not so cool next to the one I bought.
Now to me a guy who became an apple fan after Iphone 4, I totally lost it with 4S. No more apple products because it does not make sense for a big company like Apple to display this randomness in manfucaturing what is supposed to be a very very expensive phone. I can buy a laptop for what its worth.
Advice for now: try your luck with the white, seems better than black with 4S. Guys with Iphone 4, it is really not worth it the upgrade. As for the future i am never buying a product just released, I will take my time cause loosing money, time, & feeling bad is not what I expect when investing 750$ of my hardly earned money.
Good Luck all & Apple it seems your genuine Identity & noncomared quality has passed away with that great man & you are turning into just another company wanting to profit on the short run & not planning to keep your clients loyal.
What a shame Apple what a **** shame.