T-Mobile Hack Affects 37 Million accounts accessed by a “bad actor”

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Gina Narcissi

The wireless giant said Thursday it is investigating a data breach that may have affected 37 million user accounts.

Wireless giant T-Mobile revealed Thursday that it is actively investigating a data breach that may have affected 37 million users. user accounts.

The company said it first detected the malicious activity on January 5, when it noticed a “bad actor” accessing data through one of its APIs without permission. T-Mobile said in an 8-K filed Thursday with the U.S. Securities and Exchange Commission that the breach was contained within a day and no sensitive data, such as customers’ financial information, was compromised.

The Bellevue, Wash.-based carrier did not respond to CRN’s request for comment on the breach and its potential impact on business users before publication.


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According to T-Mobile, the breach, which the company believes began on Nov. 25. or thereabouts, disclosed “key customer information,” including names, billing addresses, e-mails, postal addresses and telephone numbers. The carrier added that its systems and policies prevent access to the most sensitive customer information.

“No information was received about affected customers that could compromise the security of customer accounts or finances,” T-Mobile said in a statement.

The carrier said it could face “significant costs” related to the breach and pointed to its “significant, multi-year investment” in cybersecurity, which includes working with outside security experts to strengthen its capabilities and change the company’s approach to security.

“We’ve made great progress so far, and protecting our customers’ data remains a top priority.” We will continue to invest heavily to strengthen our cybersecurity program,” T-Mobile said.

According to T-Mobile, the investigation is ongoing and there is currently no evidence that a bad actor may have compromised or compromised other systems or the network.

T-Mobile has suffered numerous data breaches in recent years. One of the biggest incidents happened in 2021. in August, when a hacker accessed personal data, including Social Security numbers, affecting more than 50 million people.

Shares of T-Mobile were down 2.37 percent in after-hours trading on Thursday.

    Learn about Gina Narcisi

Gina Narcissi

Gina Narcisi is senior editor for network and telecommunications markets at CRN.com. Prior to joining CRN, she worked at TechTarget in the networking, unified communications and cloud space. She can be reached at gnarcisi@thechannelcompany.com.

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