Hello dear i am using nokia 6300 i put securiy code but i forget that code know problem is if i change simcard phone asking for security code so plz tell me how can open ?security levael is phone if i open that asking secrity code plz if u have any solution send me waiting for your replay

Sir if you forgo the security code, You have to master reset the phone. Contact your service provider to get a master reset code at free of cost....You can also visit http://www.unlock-zone.com/ and can see different options there to get unlock code for a price. Choose any price appropriate for you.................