Total contacts confusion!

[BlackBerry-Freak]

I bought the HTC Wildfire S yesterday and I despair on the phone book. When I tap the phone button on the home screen there are appearing some contacts. These are old contacts from when I still had my BlackBerry. But I have no idea how they got to my HTC. I didn't sync it with my BlackBerry nor with my PC. I also unchecked to sync Gmail, Facebook, Twitter, etc. I want to delete the contacts but I there's no option to do so. They also don't appear in "People". They are also not from my SIM card (it's empty). I also deleted the call history 'cause I thought the contacts came from there but that didn't do the trick either. Please help me to get rid of it!!!