Just another SUCCESS story! I was a happy iphone 3G customer for about a year and finally decided to upgrade it. I picked up a new Black 32G iphone 3GS at the nearby Apple store yesterday afternoon. When I got home and put down my old 3G and the new 3GS phones side by side, I noticed the new 3GS screen looked pale and yellowish. It looked very obvious when comparing to my old 3G phone which was much brighter with cool white. I tired many different ways to adjust the brightness levels but still couldn't get the yellowish to go away nor acceptable to my vision.

I decided to google it for the similar problem that other iphone 3GS cusomters might have and ended up reading this forum. I was shocked to see there were many people having the same problems. Thanks to many users who shared their experience and knowledge here, especially something about "factory numbers" does make some differences in my story. The 3GS that I had initially with yellowish display was:
Factory: 88 (Shenzhen, China)
Production year: 2009
Production week: 30 (July)
Production number: 23780 (within this week)

I brought it back to the store next day at the genuis bar. I told the rep about the display problem and she responsed: "oh yes the yellow! we can replace your screen part". I said I purchased this phone only for a day! am I going to leave the phone here for days to replace the part? I believe she went to the manager to speak about the issue, a min later she came back and told me they were going to replace it with a brand new phone.

The same sales guy who sold the iphone to me came to see me again. Overall I was very please with his attitude and politeness, I have to give some credits to him. Anyway, he said this warm display should be within the spec and all of other 3GS phones are the same. I said to him this is unacceptable to me and it really looked yellowish when compare to other iphones. He offered me to compare my yellowish 3GS to other demo iphones in the store. With the brightness turned to max and auto-brightness set to off on both demo phone and my 3GS phone, the result was manifest. He said he would grab a new phone to replace mine, then I mentioned to him about the "factory numbers" and prefer to get anything but factory "88". Within a min he came out with a factory "87" 3GS iphone and begun for phone transfer process. I was excited for the first min until I saw the new phone display color was about the same with yellowish. I was very disappointed.

The sales guy tried to explain the "same spec" theroy and convice me to take the phone if it's somewhat acceptable. He also said they couldn't open or try another new phones. I was debating and started to remember what other poeple said in this forum... "Don't give it up and stand on the fact - this is their problem, not mine!" Then I said to the sale guy if you can't replace it with another "good" phone, I would like to return it and get full refund. I noticed that he went and spoke to the manager again. A min later, he came back and told me a new story which was a little surprising. He said the manager told him there was a new batch of phones just came into the store this morning, he could take one out and give it a try. Of course I said yes, and how could I refuse such good offer?

After a min, he took out a brand new factory "86" iphone 3GS and proceed to the transfer process. When he turned on the phone, I immediately noticed the difference. I could no longer tell the difference between their demo phones and this new 3GS phones with bright white color. At the end, he appologized about this problem but I thank him for being so patient with me. I walked out the store with a happy smiles on my face.

Finally, after two yellowish 3GS iphones were replaced, I ended up getting a good quality 3GS replacement iphone (with factory 86) from what they referred as "new batch of iphones came in today". I started to believe that they might know samething about this yellowish tint issue related to the factory #, and they probably know that the newly arrived iphones could have fixed the problem.