http://www.ebay.com/itm/GSM-GPRS-GPS...sories&vxp=mtr
I have one of these in my company roll back tow truck. A few years ago professional thieves were stealing these trucks to use in their car stealing business.
They go up to the car of choice, hook and go, less than 2 1/2 minutes, lower the tilt bed, hook up to the front end, PTO pulls on the bed and your gone, tires skid easy on the bare steel deck with a little oil or grease.
Police said they were stealing cars in early morning when diesels are making noise, ie garbage trucks, 18 wheelers, construction workers, 5 or 6 am people hear a diesel idling for a few moments, they think oh that's just a truck doing work no problem.
A good friend of mine had his 80k rollback stolen, cops only found it when they busted car stealing ring.
Anyway he had a dam good alarm, the thieves as I had said they were pros, no problem for them.
Here's how this device works, it's a GPS cell phone combo. Anywhere you cell phone works, this will work. When they steal your car, you simply ping it or send it a message just like dialing your cell phone. It takes the measurement from three different cell towers to get an exact location. The next thing it does, it sends a text back with the longitude and latitude, go to google earth punch you lat and long that's were you car is.
The device can be hidden anywhere in the car and is virtually impossible for a thief to find,
only requirement is to hook up 12 volts to it. Unlike a stand alone GPS it does not need an antenna or windshield to work properly for a clear signal to the sky. Just like your cell phone if you lose it under the seat, up in the dash or leave it in a coat in your trunk it still works just fine.
One last thing you have to buy a sim card since it works just like a cell phone.
Now in some ways I hope they steal my truck..... well not really, but it would be cool to bring down a car stealing ring that's for sure!