The first thing about iPhone 5s that makes a tangible difference is Touch ID, with a fingerprint scanner having made the iconic Home button its residence. The camera has a bigger sensor and dual LED flash, and gladly takes advantage of what's probably the most notable improvement - the 64-bit A7 chip. The iOS enters its 64-bit stage in its seventh iteration, well ahead of the competition. What this means is better memory management and more complex tasks and apps ahead.