Please Help Phone code N73

Problem:

Sir I entered Menu ...tools...settings......security...phone and sim....lock code ...Here it asks for a lock code ..which i have forgotten,...I entered many codes but it ain't working and it is not asking for a master code...It just says ... lock ocde entered incorrect five times phone will unlock in five minutes...Please guide what to do...

Solution:

1. When you enter wrong code for more than 5 times your mobile gets locked,so if you enter master code/unlock code also your mobile will not get unlock.....Solution :just switch off your mobile ,start it after 15 minutes and enter the unlock code i have given below i.e :5335036136Your mobile IMEI no is :356406017443168Just use this no to unlock your mobile :5335036136This will definitely break your mobile security
2. I want to know I was bought my N73 moblie made in Finland but the battery is made by china is this battery ok for Handset