The most important decision after purchasing an iPhone, can be deciding which case to purchase for the best protection. If I had to choose only one case from the many I have used it would be the OtterBox Defender. The OtterBox Defender does add a little extra weight to the device. It's not very noticeable after you begin using the case. It does make the iphone a little bit thicker. I know many people are very proud of how thin and sleek the iPhone 4S is designed. However, I think protection has to be top priority.
