Apple's iPhone 8, expected to launch this fall, isn't the first phone to use this sort of feature. Samsung's Galaxy S8 also features a face scanner that quickly unlocks the phone. It also packs an iris scanner, which Samsung has said is more secure. Samsung's technology, however, can be tricked with a photo.
The iPhone 8 is said to be full of new features ranging from an edge-to-edge OLED display that's more colorful and brighter than previous screens, wireless charging and more. It's expected to launch in September in limited quantities.
Apple did not reply to a CNBC request for comment.