"Social Security Number Alerts
We will alert you if we find your Social Security number on any of thousands of risky websites.
New Account Alerts
We will notify you if any new credit cards, mortgages, car loans or other accounts are opened on your Experian ® credit report.
In 2016, there were 15.4 million identity fraud victims in the U.S.
Source: 2017 Identity Fraud Study by Javelin Strategy & Research"
You have to activate this service. It's not automatic.
Learn more and activate it here: https://www.discover.com/credit-cards/member-benefits/security/ssn-newaccount-alerts/