When a smartphone is connected to a car, you are basically sharing your personal information like your call logs, phone numbers, contacts, messages and your GPS locations. It is best to not connect your smartphone to a car that is not yours, especially a rental. If you do, please make sure to erase all your information and clear the history.
Source: I heard this on the news.
Editor's Note: This tip is Bluetooth or other built in systems that connect directly to a car. Charging your phone using a 12v "cigarette lighter" style socket is safe because these do not transmit information to your car's computer system.
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