Since the June 8, 2009, release of the Apple iPhone 3GS, several customers have reported overheating of their phones, sometimes turning the white models a shade of light brown or pink. Apple responded to the claims saying there was a built-in heat sensor and replacements would be offered on a case-by-case basis, but as of June 29, 2009, no official recall has been issued.http://www.pcworld.com/businesscenter/article/167543/will_overheating_prompt_an_iphone_3gs_recall.html