1. From the home screen, press the Right Soft key.
   
2. Select Settings, then press the AT&T key.
   
3. Scroll to Security, then press the AT&T key.
   
4. Select Phone Lock, then press the AT&T key.
   
5. Select Phone Lock, then press the AT&T key.
   
6. Select On / Off, then press the AT&T key to toggle on or off.
   Note: This tutorial selects 'On'.
   
7. Enter the desired lock code, then press the AT&T key.
   
8. To unlock, first press the Left Soft key.
   
9. Enter the current lock code, then press the AT&T key.
   
10. Select Change Password, then press the AT&T key to change the password.
    
11. Enter the current password, then press the AT&T key.
    
12. Enter the desired new password, then press the AT&T key.
    
13. Re-enter the chosen password, then press the AT&T key.