Hello, I have come upon a rather alarming problem. I got the iphone 4s in December and promptly took it on vacation and used it to take hundreds of pictures. A few months ago I noticed that many of those photos had disappeared (now none remain) from my phone's camera roll but that about half of them were on my photostream and the rest I figured were on my iphoto. It turns out that while there are more photos on iphoto, not all of them are there. I've lost approximately 200 photos that I know about. When I say lost I mean they are not on Camera roll, Photostream, or iPhoto. I was not happy about the photos being erased from my photostream, nor was I happy about photostream basically just repeating most but not all of them, but now that I have just apparently lost the photos, most importantly the best ones from my vacation, I wonder if I have a defective product and am considering taking it to the Apple Store. Any input?