I posted about this issue countless times already yet no one seemed to care.
Anyway the bottomline is a good iPhone 4S screen should be somewhere in between as shown in the pics. Not as blue as the one to the left and not as yellow as the one on the right.
Your yellow tint might be caused by the glue or its just a defective unit.
Personally my SG set was quite yellow when I first bought it but I've used it for 2 weeks now and my set looks really good now. I was at the launch as well last night with Maxis and my phone looks even better than dare I say all demo units that were on display even with an anti-glare film.
There is a way to speed up the glue drying process.
1. Charge your iPhone.
2. While charging, set brightness to max and off auto brightness.
3. Go to Settings and change auto lock to Never.
4. Go to any screen you desire and leave it.
Leave it for an hour or 2 straight and see if the color tone of your yellow screen improves. I've did this method for 3 days for a few hours each day when I found last week and the color tone of my screen improved tremendously.
i agreed with you. guys, why dont give a try first before complaining the iphone. it wont cost u anything to try the step mention above.