Sharp AQUOS Crystal - Manual (Page 414)

Settings 405
2. Enter a PIN, touch Continue, re-enter your PIN, and then touch OK to save the setting.
The screen lock is set.
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If you fail to enter the correct PIN after five attempts, you will be prompted to wait for 30
seconds before you can try again.
Use a Screen Unlock Password
1. From the Screen lock settings menu, touch Password.
2. Enter a password, touch Continue, re-enter your password, and then touch OK to save the
setting.