According to Italian designer SET Solution, Apple might use a concept to feature "EYE ID" retinal scanner in iPhone 6. If Apple uses this concept than iPhone 6 will be the safest phone ever created.
We all have seen the finger print scanner in iPhone 5S, that was really a successful and now the concept of retina scan has come. Retina scanner will easily able to do all the things which finger print scanner does.
The level of security with this retina scanner will reached at a level where it has never reached before. Head over to below video to see how "EYE ID " retinal scanner works: