It recetly came to my knowledge even the best car tracking company(I think its trakker) gives the wrong impression that they monitor the veichle by stallite.. I know it sounds silly but I did't know and assumed they monitor it via satellite.
The fact is that they get the GPS signal(one sides) through satellites(free). And they use gsm to transmit locaton and stuff. And I think they use mobilink. The trick is,they call you and veify when you are going to an area with bad gsm coverage.
And wel,if the compnay is a reputeable one like trakker. They can always ask GSM providers to install mobile towers and cover a certain area if the car is stolen and is missing..
I feel they should clearly tell people they use GSM for car tracking. Theives would find out too,but that is no excuse to fool people into the false belief that their car is monitored all over the country..