Hello guys, I have a problem with my iPhone 3GS. I purchased my iPhone in June 2010. Since then, I noticed that after talking for more than 15-20min on the phone, the iPhone restarts itself. It happened to me just twice. I don't know if this is a problem or not, but it's annoying. Have you noticed something similar with your iPhones? I haven't had this problem with my old 3G.