https://www.cnn.com/2024/06/04/tech/att-service-down

“The interoperability issue between carriers has been resolved,” an
AT&T spokesperson said. “We collaborated with the other carrier to find
a solution and appreciate our customers patience during this period.”

In a previous statement sent to CNN, the company said a problem
prevented many AT&T customers from completing calls between carriers.
That also means customers from a rival service could not place calls to
an AT&T customer.

...

The outage comes less than four months after a massive disruption that
knocked out service for AT&T’s network for nearly 12 hours. In
February, tens of thousands of AT&T customers in America were unable to
make phone calls, send texts, reach emergency services or access the
internet because of an AT&T network outage.

In March, the telecommunications company said it had been hacked in a
separate incident, and the stolen data contained information such as
account holders’ Social Security numbers.

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