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I must be lucky cause I came from a iPhone 3GS to iPhone 4S no 4. But I remember looking at the 4's before 4S was released. and in the store compared to my 3GS the store display of the 4 was yellow. When I purchased my iPhone 4S on the Monday after launch day at 5th Ave. NYC, I was terrified that my iPhone 4S would be yellow. But it is perfect it's just like my 3GS.
 
I went for a quick look in town today and thought I would take a look in the store to see if they had any ones without yellow screens. They tried two and were both yellow he said wait a week or so as the load that they have had over the past couple of days could have been made at the same time in the same factory and maybe in a week they will have a different load from a different place.
 
I have a 4S and bought my girlfriend a new one off Craigslist yesterday. I didn't even know about the yellow screen issue until I put them side by side. The new one that I bought is really yellow and looks horrible compared to mine.

I guess it's time for a trip to the Apple Store.
 
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