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T-Mobile is reportedly gearing up to reveal that personal information may have been exposed in an “authorized access” incident, according to a report published Thursday. The details were provided by CSO, which discovered a letter that was recently published by the California Attorney General. The letter suggests T-Mobile discovered the breach back on Nov. 26, 2013, so we’re not quite sure why details are only surfacing now.

“We are writing to inform you of a recent incident of unauthorized access to a file stored on servers owned and managed by a T-Mobile supplier. This file contained personal information, including name, address, Social Security number and/or Driver’s License number,” the letter reads. T-Mobile says it believes that the hackers breached data on “servers owned and managed by a T-Mobile supplier” in an effort to access credit card information. “Our supplier has taken immediate measures to secure the impacted servers,” the company said. The letter also says T-Mobile will provide one year of ProtectMyID Elite from Experian, which is an identity theft prevention service that monitors credit.

The carrier says it regrets “any inconvenience this incident may have caused,” though has yet to publicly apologize. A T-Mobile spokesperson was not immediately available to comment when contacted by TechnoBuffalo.