"If you're shopping for a new iPhone, Apple gives you not just one, but three options to choose from. Do you splurge on the flagship iPhone 5s, with its cutting-edge fingerprint sensor? Do you save a few bucks, and get the colorful and capable iPhone 5c? Or maybe you sign a two-year contract and get the aging iPhone 4s for "free?" Let Gizmag help you decide, as we compare the features and specs of the three iPhones available in 2013-2014."