friends i wanted subsidy password for c975

recently got my hands on the Motorola C975 which is locked to 3's network. If I enter any other SIM, it asks for subsidy password. So, I guess this is an Operator Lock. My Boot Loader is: 0.6.3.6, SW Version: R245_U_82.21.91I.

Transfer mode:serial RS-232


Help me please