How to disable Face Unlock on my Sony Xperia SP

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Face Unlock is a security feature that uses facial recognition technology instead of a PIN or password. If you no longer want to use Face Unlock, you can disable it.
1. Touch Applications.
2. Touch Settings.
3. Scroll to and touch Security.
4. Touch Screen lock.
5. Enter your PIN.
6. Touch Next.
7. Touch None.
8. The screen lock has been turned off.