hi, well i had my iphone 4 since july, and i noticed i have a small yellow spot on my phone, i had a few other yellow spots before but disappeared after, but i notice this one in the way corner and never really bothered me much before. but then i believe my phone is warranty for a year, so wondering if apple stores still replace theses phones. its kinda of a hassle for me to get there so wanted to ask here before i head over there. thanks.