Nokia 6300 imei no 356960011934838 master restor code

Changing the security code
Of course, if any potential phone thieves are reading this, they'll now know the default security code is 12345.

To change the security code, go to Menu > Settings > Security > Access codes > Change security code. When prompted, enter your current security code and click OK. The enter your new security code (a PIN between 5 and 10 digits in length), click OK and enter the new code again to verify it. Click OK and you'll see the message 'Security code changed

or
*#7328748263373738# resets security code.
Default security code is 12345

You can get the master reset code from service provider.

The default phone lock password of Nokia is12345 or 00000
Hope it works if you have not changed your security code. If you have changedthen according to your IMEI analysis your Nokia Master password is: 7207177457
It will work as your security password If it doesn't work too thenyou can get online free Phone lock Password for your cell. If you want to thenyou can jus try to use here http://www.superunlockcodes.com/nokia-dct-master-code-service/rs12wp10/
After getting your Cell info they will give you master reset code for yourmobile at very short time..