New submitter Yuuki! writes: The Washington Post reports that T-Mobile's Credit Partner, Experian, has been breached revealing names, addresses, Social Security numbers, birth dates and driver's license and passport numbers for any customer who has applied for device financing or even services from T-Mobile which required a credit check. Both parties were quick to point out that no no credit card or banking data was stolen as part of the attack. The attack started back in September 2013 and was only just discovered on September 16, 2015. Both Experian and T-Mobile have posted statements on their websites and Experian is offering credit for two free years of identity resolution services and credit monitoring in the wake of the breach.