NOTICE OF SECURITY INCIDENT.

Dear Customer,

We are reaching out to let you know about a security incident we recently identified and quickly shut down that may have impacted some of your T-Mobile account information. The data accessed did not include names on the account, physical or email addresses, financial data, credit card information, social security numbers, tax ID, passwords, or PINs.

What Happened?

Our Cybersecurity team recently discovered and shut down malicious, unauthorized access to some information related to your T-Mobile account. We immediately started an investigation, with assistance from leading cybersecurity forensics experts, to determine what happened and what information was involved. We also immediately reported this matter to federal law enforcement and are now in the process of notifying impacted customers.

What Information Was Involved?

Customer proprietary network information (CPNI) as defined by the Federal Communications Commission (FCC) rules was accessed. The CPNI accessed may have included phone number, number of lines subscribed to on your account and, in some cases, call-related information collected as part of the normal operation of your wireless service. As stated above, the data accessed did not include names on the account, physical or email addresses, financial data, credit card information, social security numbers, tax ID, passwords, or PINs.

Where Can I Get More Information?

If you have additional questions, feel free to contact us online, in a store or through our customer service team at 1-800-937-8997. For additional resources regarding security on your account, you may also review our Privacy Resources at: https://www.t-mobile.com/responsibility/privacy.

We are sorry for any inconvenience this may cause you. We take the security of customer information seriously and, while we have a number of safeguards in place to protect customer information from unauthorized access, we will continue to work to further enhance security so we can mitigate this type of activity.

Sincerely,

Matt Staneff
Chief Marketing Officer
T-Mobile USA