In a startling revelation, AT&T announced that it had suffered a significant data breach affecting "nearly all" of its cellular customers, as well as customers of mobile virtual network operators (MVNOs) using AT&T's wireless network and some landline customers.
The data that was taken was from May 1 through Oct. 31, 2022, with a small number of additional records from Jan. 2, 2023, which has raised serious concerns about customer privacy and data security.
The compromised data includes records of calls and text messages, along with phone numbers that AT&T or MVNO cellular numbers interacted with during the specified period. For some records, cell site identification numbers were also exposed.