The Experian data breach affected a significant number of users, exposing personal information that can be used for identity theft, phishing, and fraud. If you've ever had an account or relationship with Experian, it's worth checking whether your data was involved.
What Happened
In 2015, hackers breached servers operated by Experian that were used to process credit applications submitted by T-Mobile customers and applicants. Experian disclosed the breach in October 2015, affecting approximately 15 million people who had applied for T-Mobile service or financing over a two-year period, even if they were not existing Experian customers directly.
What Data Was Exposed
The exposed data included names, addresses, Social Security numbers, dates of birth, and identification numbers such as passport or driver's licence numbers submitted as part of T-Mobile credit applications.
Why This Still Matters
Even breaches from years ago remain a risk today. Stolen data is sold, traded, and reused indefinitely. Credentials from old breaches fuel credential stuffing attacks — automated attempts to reuse your email and password combination on other sites. If you reused a password anywhere, one old breach can compromise several current accounts.
How to Check If You Were Affected
Use our free breach checker below — enter your email and we'll scan it against known breach databases instantly, no signup required.
What to Do If You Were Affected
- Change any reused password immediately, starting with your most sensitive accounts.
- Enable two-factor authentication wherever it's offered.
- Monitor financial accounts closely if payment or banking data was involved.
- Watch for phishing — breach data is often used to craft convincing scam messages.
- Freeze your credit if your SSN or government ID number was exposed.
👉 Check your own exposure in 30 seconds → scan your email free.
Frequently Asked Questions
When did the Experian data breach happen?
The breach was discovered and disclosed by Experian in October 2015, affecting people who applied for T-Mobile service or device financing between September 2013 and September 2015.
What data was stolen in the Experian breach?
Names, addresses, Social Security numbers, dates of birth, and identification numbers (such as passport or driver's licence numbers) submitted in T-Mobile credit applications were exposed.
Why was T-Mobile data affected in an Experian breach?
Experian processed credit checks on behalf of T-Mobile for customers applying for service or device financing. The breached servers held this application data even though the individuals were not necessarily Experian's own direct customers.
How do I check if I was affected by the Experian breach?
Experian offered free credit monitoring to affected individuals. You can also check your email at Scan My Shadow and monitor your credit reports for suspicious activity, especially given the SSN exposure.
What was the fallout from the Experian breach?
T-Mobile and Experian faced significant criticism and multiple lawsuits. Experian ended its data processing relationship with T-Mobile following the incident, and affected individuals were offered two years of free credit monitoring and identity theft protection.