AT&T has reported a data breach that occurred between April 9th and April 21st by three employees of a third-party vendor working with AT&T. According to the report, the vendor’s employees had access to a wide swath of users’ personal information including call record, social security numbers, and possibly financial data like credit card numbers. However, none of that information was the target of the hackers. Instead, the employees were trying to secure unlock codes to be used to unlock AT&T phones. AT&T’s report of the breach came out in a filing with the state of California, where breaches involving at least 500 customers must be reported.