T‑Mobile Informing Impacted Customers about Unauthorized Activity

We are currently in the process of informing impacted customers that after a thorough investigation we have determined that a bad actor used a single Application Programming Interface (or API) to obtain limited types of information on their accounts.

As soon as our teams identified the issue, we shut it down within 24 hours. Our systems and policies prevented the most sensitive types of customer information from being accessed, and as a result, customer accounts and finances should not be put at risk directly by this event. There is also no evidence that the bad actor breached or compromised T-Mobile’s network or systems.

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While no information was obtained for impacted customers that would compromise the safety of customer accounts or finances, we want to be transparent with our customers and ensure they are aware.

No passwords, payment card information, social security numbers, government ID numbers or other financial account information were compromised. Some basic customer information (nearly all of which is the type widely available in marketing databases or directories) was obtained, including name, billing address, email, phone number, date of birth, account number, and information such as the number of lines on the account and service plan features.

We understand that an incident like this has an impact on our customers and regret that this occurred. While we, like any other company, are unfortunately not immune to this type of criminal activity, we plan to continue to make substantial, multi-year investments in strengthening our cybersecurity program.