By Kim Komando, USA Today

There are plenty of reasons to rent a car, from leaving an unreliable car behind on a vacation to getting around on a business trip. But there’s a real hidden danger when doing so that you may not even realize — one that potentially puts you and your family at substantial risk.

Rental companies continually upgrade their fleets with newer-model cars, which means many now have the latest infotainment systems, which let you connect, or “pair,” your smartphone via Bluetooth with the car. This lets you take calls over the car’s audio system, dial from the center console, get directions or stream your music. Others include a USB connection so you can do all that and charge your phone.

When you connect your gadget to a car with Bluetooth, the car stores your phone number to make it easier to connect later. It also stores your call logs, including any contacts you dialed. Just one problem: All that information is saved inside the system and just sitting around for the next renter to find.

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