programming a car anti-theft device

This device works with any telecommunication network. I ve being able to build a switch that can trigger off the stolen car and makes it immoble until i triger it on again. But my problem is how to locate the car using the telephone network. PROBLEM IDEA; i need a j2me program which will be installed on a phone(this phone will be inside the stolen car) and will be able to help the phone to read the cell id it is recieving its service/network from and also send the cell id to any phone number that send it a unique code/message

Did you have a question?

How about just making a super loud siren go off once the phone in the stolen car has been triggered and the car has been immobilised then the car thief runs away and someone rings the cops to try stop this noise

sounds like you need something like this
**broken link removed**