In a filing with California state regulators, AT&T said an unknown amount of customer data was accessed in a breach, PC World reports. Compromised data included Social Security numbers and call records reportedly accessed between April 9 and 21. California law requires companies to report breaches affecting at least 500 customers. “Employees of one of our service providers violated our strict privacy and security guidelines by accessing your account without authorization,” AT&T wrote in a letter to customers. “AT&T believes the employees accessed your account as part of an effort to request codes from AT&T (that) are used to unlock AT&T mobile phones in the secondary mobile phone market.” The company believes three employees of a vendor may have improperly accessed customer accounts.
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