AT&T - 10/06/2014
AT&T has informed California regulators of a data breach that occurred with a third party service provider."Employees of one of our service providers violated our strict privacy and security guidelines by accessing your account without authorization," the company said in a letter to affected customers. "AT&T believes the employees accessed your account as part of an effort to request codes from AT&T than are used to unlock AT&T mobile phones in the secondary mobile phone market."Personal information such as Social Security numbers and phone records were accessed. The incident took place between April 9th through April 21st, but the California regulators were just informed this week. AT&T would not disclose how many customers were affected, but the law requires disclosure if more than 500 people have been affected.