Apple’s iPhone Duo uses Touch ID instead of Face ID to unlock the device. The fingerprint scanner isn’t as convenient as having the handset simply recognize your face, but there are actually three ways to speed up the process.
One involves cutting out a step in signing in with Touch ID, while another lets you skip Touch ID entirely. The third is… odd.

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July 28, 2012: Apple buys biometrics company AuthenTec, acquiring the technology that will power Touch ID for authentication and secure payments on the iPhone and other devices.