Hi - I have recently made the switch from iPhone to S4 and I will never look back. So much more advanced and makes the iPhone look dated and basic. The reason for my post is that I don't understand what a couple of the icons mean at the top of the screen. The first icon looks like an eye with 3 'lashes' at the top if it. The second is like the wifi bar but has a large capital N on it. Does anyone know what these are for please as it's baffling me!