AT&T is investigating claims that approximately 86 million customer records are being sold on a cybercrime forum, believed to be a repackaging of data from a previous breach. The leaked information includes sensitive details such as dates of birth, phone numbers, and social security numbers, raising concerns about potential identity theft. AT&T is working to determine the origins of the data and has alerted law enforcement.

AT&T has introduced a new security feature called "Wireless Lock" to help protect customers from SIM swapping attacks by preventing unauthorized changes to account information and number porting. This feature, which can be managed through the AT&T app or website, enhances security by restricting access even to AT&T employees, although it arrives later than similar offerings from competitors like Verizon. SIM swap attacks have become increasingly common, leading to significant financial losses and breaches of personal accounts.