I think you are looking for something like the ebay item you mentioned in post 3. It seems to work in any area with good cellphone coverage. I assume it has some sort of inbuilt cellphone and gps device, so you don't need to use one of your spare phones. Since you will know where YOU are, you only need the minimum monthly subscription. Check with the supplier before you buy from a third party though.
The other item (from vehicle-tracking.com) is definitely NOT what you want, it simply records where the vehicle has been which is not much use if you can't get the vehicle back.
However, the police may not respond to your information about the location of the vehicle in the same way as they would to systems such as lojack simply because with lojack type systems they can actively track the vehicle when it is on the move.
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