https://www.cnbc.com/2017/11/14/apple-iphone-rear-facing-3d-sensor.html >Apple is exploring a rear-facing 3-D sensor system for the iPhone to be released in 2019, Bloomberg reported on Tuesday citing people familiar with the matter. >The technology would be different than the TrueDepth sensor that's currently on the front of the iPhone X. The iPhone X's system relies on a light technique that projects thousands of laser dots on a person's face to generate an image. The new technology could bounce light of a person's face and calculate the time it takes for the laser to bounce off in order to create a 3-D image.