not sure if this was a huge coincidence or whatever, but I was at the beach and I put my iPhone in my shoe to listen to some music. I noticed the front bottom home button part was exposed to the sun later on and it that it got quite hot. so quickly i took a look at it to make sure it was ok and i noticed the yellow screen at the bottom was much less yellow. it might have been me getting more used to it. i'm not too sure.