From the Nokia support site:
" * The security code or lock code protects your device from unauthorised use.
* The default code supplied with the device is 12345. However, it is recommended to change the default code to your own. The instruction on how to change the security code is provided in the user guide or Nokia Web site.
* Keep the new code in a safe place separate from your device.
* If you get error notifications after 3 consecutive times security code entries, reboot the device and wait for 15 minutes, then try again. If the problem persists, contact your operator or local Nokia Care Point."
Source:
http://www.nokia.co.u...qt=security+code+6500
Chris