Sony Ericsson — regd subsidy password

Dear Sir/Madam,
I have Soni Ericsson J100i Mobile with Airtel Connection.2 years Subscription Period has end and recharge for two year validity.Now I want to Change Another Sim Card in this Hand Set. So Please send me the subsidy password of my phone.Sothat i used another SIM in my phone. Its IMEI no is:[protected], s/n:[protected] and my mobile phone number is :[protected]