I discovered this the first time I had to rent a car from my dealer. There were about 12 other phones connected in, and my phone would have ended up with all of

I discovered this the first time I had to rent a car from my dealer. There were about 12 other phones connected in, and my phone would have ended up with all of their contacts if I hadn't thought to disable contact sharing. (Fortunately the Mazda UI asks before doing that.) I went through that list and un-paired every phone, and cleared out the contacts list in the entertainment center. I also informed my dealer of the issue, and I hope they are a bit more mindful of it going forward. Cars are basically designed to only ever be used by one or two people at a time, so this isn't a huge risk for most owners, but for rentals it's kind of a privacy risk.