I need the installer code to change moitoring station phone #

My contract is up and i want to continue to use my system, i read there is an installer code to reprogram the system. I want to change the phone number the system calls durring an alarm for the monitoring station to call my cell phone or to call my computers modem to write software to have it notify me of an alarm. I know about option 43 for the pager, but i don't want it calling the monitoring station that i don't pay for monitoring,