Fix Your IPhone’s Touch ID by Retraining It
Apple Touch ID is great when it works. If you’re having trouble recognizing your iPhone’s fingerprints, it’s time to practice a little more.
We’ve already covered how to complete the initial iPhone training by trying multiple angles or even enrolling your finger more than once . Instead of removing your finger from Touch ID and trying again, iOS lets you add it to your fingerprint.
Open Touch ID and Password in the Settings app. Then just press your finger on the Home button and you will see a highlighted fingerprint icon. You just sent your Touch ID to school without starting over. Touch ID contains more information about that finger. Try this tip when your iPhone never records your fingerprint correctly.
Best Touch ID Performance | Josh Betz via BGR