Phone numbers not deleted in new (used) Prius

Just thought I'd post a reminder about deleting phone numbers left via the bluetooth system if you are selling your Prius. I just bought a used 2011 Prius 3, and as I was using voice commands to enter phone numbers, I found very early that I was out of room. I had to delete numbers entered by the prior owner to make room for mine. For each number, I had to listen to the prior owner state the person's name, and I could read the number on the dash display. It wouldn't have been too hard for me to find the prior owner, if I wanted to, because some of the numbers were "Home Phone," etc. Anyway, they're all deleted now. Also, my daughter has a used 2012 Prius. Her prior owner's name came up on the screen as a listening option, "John Smith's iPod."