Equifax 800-525-6285
Experian 888-397-3742
Trans Union 800-680-7289
The alert on your file is called a "fraud alert". Then the credit bureau has to get in touch with you to confirm any new credit request under your name. Of course, this slows the processing time when "you" try to get credit from a new source. Not a big deal.
Once you place the fraud alert with any
one of the companies, they will notify the other credit bureaus.
You can also get a free credit report once a year from each of the three credit bureaus. Or you can also get the report once a year by calling 877-322-8228 or online at
https://www.annualcreditreport.com/cra/index.jsp
Another good web site is
http://www.ftc.gov/bcp/edu/microsites/idtheft/