US telecoms firm AT&T notifying millions of customers over data breach The GuardianAT&T resets account passcodes after millions of customer records leak online TechCrunchWhat to know about the AT&T data breach affecting millions of users The Dallas Morning NewsAT&T Resets Millions of Passcodes After Customer Records Are Leaked The New York TimesAbout 73M current, former account holders impacted by data leak linked to dark web: AT&T KXAN.com