I have the white iPhone, I waited about a month for it to come in the mail. I compared it w/ the iPad 2 and 2nd gen touch on full brightness. The 2nd gen is the brightness out of all of them. I believe I have the yellow tint screen and wondering if I should exchange it for another one? How long do I have to exchange it for another one? If you had this problem, would you exchange it or keep it?