Apple usually keeps the reasons behind some of its product development decisions pretty close to the vest, and the iPhone 4S is no exception. Still, the naming convention is not too big of a surprise if you take a closer look at the relatively brief upgrade history of the iPhone product line. When it came time to replace the iPhone 3G in 2009, Apple didn’t name the new device “iPhone 4”; rather, it tacked on an S to make the iPhone 3GS. In that instance, the iPhone 3GS offered few changes to the iPhone 3G’s case—some stylistic changes to the lettering on the back of the phone, and a oil-resistant coating for the front screen were about the only exterior modifications. In the iPhone 3G-to-iPhone 3GS transition, the biggest changes occurred to the phone’s interior, and that appears to be the case with the iPhone 4S as well—hence, the name.
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