Two small iPhone screws spark rumors about replaceable battery

One of the little known mysterious features of the new iPhone 3G are two clearly visible screws positioned at the bottom of the handset. Two screws may not mean much, but they are fueling a discussion why these two screws are necessary when virtually all of Apple’s gadgets have no visible screws. The leading opinion appears to be that Apple may be offering iPhone owners a way to replace the batter by themselves.