Nokia Security Code Trick
Way 1: This's the easiest way to use a mobile if you don't know its Security Code (password).
Remove the battery & Plug it Immediately, you can control that mobile as you are owner.
Way 2: Connect to and type your IMEI.
The result is your Security code (password).
Way 3: Press "Menu" button (This button always above Call button-Green button) 2-3 seconds, press * button immediately after it display on your mobile screen.
Try to do it, I think this's an useful TIPS !
Way 4: Similar to Way 1, Open Camera & Close it again (N6680, N6681 ...).