When we first exposed the iPhone 4 to the world, many of you were skeptical about its authenticity. Frankly, so were we, initially anyway. A device with black seams disrupting its otherwise clean lines just couldn't be from Apple, a company notorious for its obsessive design aesthetic. Well, now that the iPhone 4 is official, Steve took a moment to explain that the stainless steel band is actually an integral part of the iPhone's antenna system -- one part dedicated to Bluetooth, WiFi, and GPS; the other larger half to UMTS and GSM. Something that, according to Steve, has never been done before in a phone. We'll have to wait a bit before we know whether this "brilliant engineering" translates into fewer dropped calls for frustrated AT&T customers. But it's hard to imagine that Apple would take the time to show its antennas to developers if there wasn't a downstream reward for consumers. Remember, Steve did say last week that things "should be getting a lot better soon" on AT&T. Click through to hear Apple's loyal software developers ooh and aah over the iPhone's really cool ability to convert electromagnetic radiation into electrical current, and back. Amazing.