"While the data does not include customer names, there are often ways, using publicly available online tools, to find the name associated with a specific telephone number"
In other words, your phone number and name is likely in a public record somewhere. It's not that private.
The info leak should not have happened but in the grand scheme of things it's not that big a deal. "The content of the calls and messages was not compromised." The worst it does is reveal who has been sending messages to or calling each other.
That metadata was can be terrible for many people like politicians, those having affairs, drug dealers or buyers, those with sensitive healthcare providers, and so on.
This. If you're in an abusive relationship and your abuser sees that you're calling a lawyer, a helpline, a family member etc, bad things can happen quite quickly. This information is non-public for a reason, and you don't have to be a drug dealer to be protected by it either.
Yeah it's not good. But would be worse if the actual contents of the messages had been leaked.
That said the few abusive people I know are not smart enough to find data dumps of AT&T call records on the dark web. Nor could they pay for them. Nor could they likely make sense of them. But I'm sure some could.
In other words, your phone number and name is likely in a public record somewhere. It's not that private.
The info leak should not have happened but in the grand scheme of things it's not that big a deal. "The content of the calls and messages was not compromised." The worst it does is reveal who has been sending messages to or calling each other.