Sharp AQUOS Crystal - Manual (Page 413)

Settings 404
4. When prompted, draw the screen unlock pattern again, and then touch Confirm.
The screen unlock pattern is saved.
Note: Clear the Make pattern visible check box if you do not want the unlock pattern to display on
the screen when you unlock it.
Note: To change your unlock screen pattern, from home, touch > Settings > Security >
Screen lock.
Note: If you draw a mistaken pattern five times in a row to unlock the screen while a Google account
is activated, your phone determines that the pattern was forgotten and a prompt appears. Touch the
prompt and log in to the Google account to unlock the screen.
Use a Screen Unlock PIN
1. From the Screen lock settings menu, touch PIN.