Does the OS create a PhoneBook DB file per each phone that is sync'd? I have 2 PhoneBook DB files and I want to remove one if it is not tied to my primary phone. The other part is how can I find out which Phonebook DB file is tied to which phone?

Does the OS create a PhoneBook DB file per each phone that is sync'd? I have 2 PhoneBook DB files and I want to remove one if it is not tied to my primary phone. The other part is how can I find out which Phonebook DB file is tied to which phone?

Yes, there's a separate one for every phone. To determine which one is which, locate your phone's Bluetooth MAC ID. It will be part of the file name.