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Sorry if this has been answered but if your car is still within connected range to your phone but you can't see it, does that mean anyone has access to your car?
Distance may vary but you'll need to be within 5-10ft in order to unlock the car. I live in a townhome and did a test where I left my bluetooth connected phone on the floor of the 2nd floor above the garage and walked down to the garage to try to open the car and it would not open.
There's also a youtube video doing various tests to see how far you may need to be to unlock the car.