Read help info
The phone lock code protects the contents of your phone from unauthorised use. 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.
Find "Change password"
Scroll to Settings and press OK.
Scroll to Security and press OK.
Scroll to Change password and press OK.
Change the phone lock code
Key in your current phone lock code and press OK.
Key in a new phone lock code and press OK.
Key in the new phone lock code again and press OK.
Press Disconnect to return to standby mode.