Three years after a hacker first teased an alleged massive theft of AT&T customer data, a breach seller this week dumped the full dataset online. It contains the personal information of some 73 million AT&T customers. A new analysis of the fully leaked dataset — containing names, home addresses, phone numbers, Social Security numbers, and dates of birth — points to the data being authentic. Some AT&T customers have confirmed their leaked customer data is accurate. But AT&T still hasn’t said how ...