AT&T Mobility customers’ Social Security numbers and call records were accessed by people outside of the company. The breach took place between April 9-21, but was only disclosed this week in a filing with California regulators. AT &T wouldn’t say how many customers were affected, but state law requires such disclosures if an incident affects at least 500 customers in California. The company declined to comment on whether the phones had found their way to the second-hand market through legitimate channels or as a result of theft.”]