Change phone lock code
If the phone lock code is turned on, it needs to be keyed in when you turn on your phone. Follow these instructions to change the phone lock code.
You need to turn on use of phone lock code before you can change it. Click here for information on how to turn on use of phone lock code.
1. Find "Change Passcode"
Press Settings.
Press General.
Press Passcode Lock.
Press Change Passcode.
2. 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.
Key in a new phone lock code.
Key in the new phone lock code again.

3. Exit
Press the Home key to return to standby mode.