The American multinational giant AT&T confirmed to have suffered a data breach last April, personal data of an unknown number of users was exposed. Social Security numbers, birth dates and call records were exposed between April 9 and 21. The attackers were interested to request codes that can be used to unlock AT-T mobile phones. AT &T is offering affected accounts a year of free credit monitoring and recommends that people change the passcode. The contractors employees who were responsible for the data breach were already terminated.”]
Source: https://securityaffairs.co/wordpress/25855/cyber-crime/att-suffered-data-breach.html