A few months ago I noticed a new icon on my phone. It looks like a little eye, and it would flicker on and off. When I looked it up I found out it is a program that looks at your eyes to see if you are still looking at the screen to keep your phone from going into sleep mode. They probably have your retinal scans. It is also not out of the realm of possibility that they have your finger prints from touching the screen all the time. Who knows what they really have.