Renting newer high-tech equipped autos can expose your personal information. Sometimes that is a "good thing" https://arstechnica.com/information...car-thieves-paired-phones-with-jeep-uconnect/ Lots of information can be saved when you connect your phone to a car: GPS history. Device name. Address book. In-car internet search history. Music-streaming login, such as Spotify or Pandora. Call log and text messages if you use hands-free calling. WiFi identifiers. Before returning the rental, take a few minutes to delete your data. Go to vehicle's infotainment system settings, or the Bluetooth setup menu, and delete your device from the paired phones list. A more thorough way to clear data is by finding the factory reset option in the menu.