Find "Change Passcode"
Press Settings.
Find "Change Passcode"
Press General.
Find "Change Passcode"
Press Passcode Lock.
Find "Change Passcode"
Press Change Passcode.
Change phone lock code
Key in your current phone lock code.
Key in a new phone lock code.
Key in the new phone lock code again.
Exit
Press the Home key to return to standby mode.
Find "Change Passcode"
Change phone lock code
Key in a new phone lock code.
Key in the new phone lock code again.
Exit