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AT&T says leaked data of 70 million people is not from its systems
(www.bleepingcomputer.com)
BleepingComputer asked AT&T if it was possible the data came from a third-party service provider or vendor but has not received a response at this time.
That was my thought: AT&T didn't get breached and leak the customer data of 71 million themselves. They merely sold that data to a third party who got breached and leaked the customer data of 71 million people.