Using Touch ID.
Touch ID is a new screen lock option that lets you unlock your device with your fingerprint. Your phone has state-of-the-art fingerprint recognition technology that can register your fingerprint while setting up the screen lock, and then recognise it again to unlock the screen.
To set up Touch ID:
On the homescreen, tap Settings
Tap Touch ID & Passcode
Switch iPhone Unlock on
You'll be asked to touch the home button several times so your phone can memorise your fingerprint. Tap Continue
Enter a Passcode. You'll be asked to confirm it
You can add more than one fingerprint to unlock your phone by tapping Add a fingerprint... again. You can also switch iTunes & App Store to use Touch ID when making purchases
Touch ID will now be set up on your phone.
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