This happens randomly, maybe biweekly. My history in safari on my iPhone 3g will one day completely clear itself out. I don't do it because I don't have a need to clear it. Also, I wouldn't have a chance if I wanted to. Why does this happen like clockwork? I am the only one who uses my iphone. I count on my history being there and most of the time after collecting for a few days it will just disappear. Is it tied in to some setting? Thanks!