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AT&T confirms data for 73 million customers leaked on hacker forum
(www.bleepingcomputer.com)
Information about data breaches, data leaks, ransomware attacks, and other related stories.
This is actually a horrible implementation though, because they just tie your new number to your old number. They don’t invalidate your old number at all. So now you have two SSNs that can be used to steal your identity.
I don't know if that is actually the case or not, but regardless, yeah, it's overall a pretty bad system.