A reliable GPS locator for car?

I need a good product to be put in car in case it got stolen and has an iphone app. For tracking.

I'm sure Garmin products have a similar feature. They usually have really good quality GPS

Http://www.brickhousesecurity.com/category/gps+tracking/real+time+gps+tracking.do

Some may require a separate cell phone account for it to transmit data to your cell phone or service account (monthly charge). Unless you have a real expensive car, it may be cheaper to insure it for theft. One service plan is $30/mo. If you drop the service, it will take 5 business days to deliver and install a new sim card and a $50 reactivation fee. So you can't use it after your car is stolen.

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