The yellow pictures that affected some of the iPhone 4's is a separate issue. That was related to the hardware and Apple replaced those phones. The iPhone 4S screen appears slightly yellow in comparison to the iPhone 4. I do not believe it is related to glue because I've had mine for nearly six weeks and it still has the yellow tint. I think it is a screen setting. It doesn't bother me at all and I don't really notice it unless I do a direct comparison to the iPhone 4.