Apple's new iPhone models.(Photo: Robert Deutsch USA TODAY) Story Highlights Apple brings out two models for the first time The Touch ID fingerprint scanner works well and is useful NEW YORK It's perfectly reasonable to assume that anyone thinking about buying a new iPhone when the latest devices hit retail on Friday would fixate on the hardware itself, especially with Apple trotting out two new models. Apple is unleashing colorful handsets called the iPhone 5c, priced at $99 to start with a contract. And a brand new $199-on-up flagship phone, the iPhone 5s, brings with it beefy 64-bit computing power, a souped-up camera and the feature most people are pointing to, the Touch ID fingerprint reader. But the biggest change to come to the iPhone arrives with iOS 7, the operating system at the heart of the newest handsets. As of Wednesday, it can also be downloaded to freshen up the iPhone 4, iPhone 4S and the now discontinued iPhone 5 as well as some iPads and the iPod ...