No matter what is the relationship now between your iPhone and car, it is going to change. Apple is looking to integrating car system with its iPhone. The USPTO published a number of Apple patent applications, including two related to automobiles.
Apple’s recent acquisition of indoor positioning system company WiFiSLAM could work very well in terms of helping provide a way to make the car and mobile phone integration system work. The system would involve pairing a car and an iPhone via Bluetooth, and then using that connection to automatically detect when a car ends up actually parking in a spot. Then, it uses sensor data communicated from the parking facility itself to peg a location.
The other car-related application is a system that would turn the iPhone into a remote car starter, unlocker, and essentially a parental control device for a target vehicle. Again Bluetooth is used to pair a car and a handset, and then user can choose their level of security to unlock the car.
I remember in one of James Bond movie, 007 was using a device to control his car. I think we are one step closer to make it to reality, but the consequences of over replying on technology will do more harm than good to our human race.