Nokia C3-01

Find "Change security code"

Press Menu.

Find "Change security code"

Press Settings.

Find "Change security code"

Press Security.

Find "Change security code"

Press Access codes.

Find "Change security code"

Press Change security code.

Change phone lock code

Key in the current phone lock code (default is 12345) and press OK.

Change phone lock code

Key in a new phone lock code and press OK.

Change phone lock code

Key in the new phone lock code again and press OK.

Exit

Press Disconnect to return to standby mode.