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(ATLANTA BUSINESS CHRONICLE) -- Attackers have compromised the personal information of an undisclosed number of AT&T Mobility wireless customers, the Dallas-based telecommunications giant has confirmed.

AT&T confirmed the data breach Friday, saying outside attackers — allegedly employees of one of AT&T's service providers — stole personal information on Atlanta-based AT&T Mobility customers. The company would not disclose the number of affected users.

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"We recently learned that three employees of one of our vendors accessed some AT&T customer accounts without proper authorization," according to a statement released by the company. "This is completely counter to the way we require our vendors to conduct business.

"We know our customers count on us and those who support our business to act with integrity and trust, and we take that very seriously. We have taken steps to help prevent this from happening again, notified affected customers, and reported this matter to law enforcement."

The breach was discovered May 19, and AT&T believes the data was accessed in an attempt to unlock phones for secondary market resale, the publication CSO reported.

AT&T Mobility filed a breach notification in California this week, CSO reported. From April 9 until April 21, one of AT&T's third-party providers violated the company's security and privacy guidelines and was accessing customer data.

AT&T says in the notification that the stolen information includes Social Security numbers and call records.

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