
Nokia Asha 503
Find "Phone lock"
Press Settings.
Press Phone lock.
Turn on use of phone lock code
Press the indicator next to "Security code" until the function is turned on.
Key in the required phone lock code and press the confirm icon.
Key in the phone lock code again and press the confirm icon.
Turn off use of phone lock code
Press the indicator next to "Security code" until the function is turned off.
Key in your phone lock code.
Key in your phone lock code.
Return to the home screen
Press and hold the Return key to return to the home screen.