T-Mobile confirmed Sunday that it’s looking into an online forum post that claims to be selling a large trove of its customers’ sensitive data. 

The stolen data allegedly contains the data for approximately 100 million T-Mobile customers and can include customers’ IMSI, IMEI, phone numbers, customer names, security PINs, Social Security numbers, driver’s license numbers, and date of birth.

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“We are aware of claims made in an underground forum and have been actively investigating their validity,” a T-Mobile spokesperson said in an email to The Verge. “We do not have any additional information to share at this time.”

A March 2020 breach exposed some T-Mobile customers’ financial information, Social Security numbers, and other account information.

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