Samsung SGH-T989AABTMB - Manual (Page 218)

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Changing the Screen Lock Pattern
This feature allows you to change the previously stored unlock
pattern and update it if necessary. This process is similar to
changing your password from time to time.
1. Press ➔ and then tap (Settings) ➔
Location and security.
2. Tap Change screen lock.
3. Retrace your current pattern on the screen.
4. Tap Pattern and repeat steps 3 - 7 from the previous
section.
Using a Visible Pattern
When enabled, this feature displays the onscreen lock grid that is
used to unlock the phone.
Using Tactile Feedback
When enabled, the User tactile feedback option, you will feel
vibration as feedback while drawing the pattern, using a PIN or
password lock.
PIN Lock and Unlock
1. Press ➔ and then tap (Settings) ➔
Location and security.
2. Tap Set up screen lock.
3. Tap PIN.
4. Enter a PIN number using the numeric keypad and touch
Continue to confirm the password.
5. Confirm the PIN by re-entering it and tap OK to confirm.
Your phone now requires you to enter this PIN number in
order to unlock the phone.
Password Lock and Unlock
1. Press ➔ and then tap (Settings) ➔
Location and security.
2. Tap Set up screen lock.
3. Tap Password.
4. Enter a password using the keypad and tap Continue to
confirm the password.
5. Confirm the password by re-entering it and tap OK to
confirm.