AT&T says an attack leaked data for ‘nearly all’ its customers

A major security breach recently exposed call and text records for “nearly all” AT&T customers, the carrier acknowledged via a statement on Friday. It explains that in April, the data was “illegally downloaded from our workspace on a third-party cloud platform,” and included not just direct customers, but people signed up to MVNOs (mobile virtual network operators) like Cricket Wireless, Boost Mobile, and Consumer Cellular. Even AT&T landline users who interacted with those cellular numbers have been impacted.