After what seemed like ages, it’s finally here: Apple officially unveiled the iPhone 5 on Wednesday. However, while I’m typically a fan of Apple products, allow me to explain why I’ll be hanging onto my iPhone 4S in lieu of snagging this year’s model. First, the most obvious change from the 4S is that the 5 is more than 0.25 inches longer overall, with a 4-inch screen, up from 3.5 inches. Much less apparent is the fact that its 0.07 inches thinner and a whole ounce lighter. The back of the phone is now mostly aluminum. Apparently, enough users were …