If you forget the security code means get the master reset code for that one, master unlock code is a code that completely resets your phone, removing any security locks , get the code from this site Ihav.net, it has the best services for the master reset code for your Nokia model mobile.....I hope that it may helpful to you....
If you forget the phone security password then try default code like 0000 or 1234 to reset it .If it doesn't reset your mobile then visit Unlocking4Free.com here they provide master reset code for your Nokia 9300 mobile models at free of cost using this code you can reset your mobile and again set a new password.