Originally Posted by
Chuckles
OK, but if I only un-freeze one, will the card issuer check THAT bureau? Or is it an unknown which they will check, so one needs to un-freeze all three to be sure? Or does each issuer (Chase, Citi, Barclay, etc) has their own 'favorite' so if I know which bureau each prefers, I only need to un-freeze that one? If that is true, we should add that info to the wiki

They seem to have their own favorite based on the state you're in.
Doctor of Credit has a post series that collects that info for the major issuers.