AT&T has confirmed a security data breach in which attackers have compromised the security of a number of its mobile customers and stolen personal information including Social Security numbers and call records. The Dallas-based telecommunications giant did not specify the number of customers or type of information affected by this data breach, but state law requires such disclosures if an incident affects at least 500 customers in California. The employees who were responsible for the breach were terminated and will no longer for the company. The hackers would have also been able to access its users’ credit report with Customer Proprietary Network Information (CPNI)
Source: https://thehackernews.com/2014/06/at-suffers-data-breach-customers.html