White iPhone 3GS units discoloring from excessive heat
Multiple tipsters, French site Nowhere Else and AppleInsider itself have all reported first-hand accounts of the back of white iPhone 3GS models turning brown or pink in certain areas that are usually towards the edges.
When the problem manifests itself can vary but usually follows sometime after particularly intensive activity that generates significant heat, such as using 3G data extensively, playing games or navigating with GPS. It's also suspected that engaging in regular tasks for a long time, such as playing music or browsing the web on Wi-Fi, can also trigger the symptoms.
Speculation exists that the issue centers on the battery: Rapid Repair's Aaron Vronko, as well as those affected by the issue directly, claim the color shifts occur around the outline of the battery pack and that it's likely due to flawed battery cells that react badly to the added stress.
