The iPhone 5s is available in three metallic colour options and each includes a "Touch ID" fingerprint sensor embedded in the "home" button.Heralded as the "most forward-thinking smartphone in the world" at the time of its introduction, the iPhone 5s models have a 4" (diagonal) widescreen multi-touch IPS LED-backlit 1136x640 native resolution (326 ppi) "retina display," dual cameras -- a rear 8 megapixel, 1080p "iSight" camera with 1.5 micron pixels, an f/2.2 aperture, a dual LED "True Tone" flash and more as well as a front 1.2 megapixel, 720p "FaceTime" camera.