The iPhone 5s took fingerprint sensors mainstream on smartphones, but: the new ICE Unlock Android app lets users unlock their Android phones via the rear-facing camera. Developed by Birmingham, Ala.-based security developer Diamond Fortress Technologies (DFT), ICE Unlock aims to do away with long passwords and expensive hardware. After downloading and opening the ICE Unlock app (compatible with Android 4.0 and up?) you'll be asked to agree to a user agreement and then watch a video tutorial of the sign-up and sign-in process.



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