SEATTLE — T-Mobile U.S. said Thursday that approximately 15 million people may be victims of a cyberattack on one of its vendors, Experian credit services company.

John Legere, CEO of the Seattle-area wireless carrier, said in a statement that the hacked records include those of new applicants requiring a credit check for service or device financing from Sept. 1, 2013, through Sept. 16, 2015.

The records include information such as name, address and birthdate, as well as encrypted fields with a Social Security number and ID number (such as a driver’s license or passport number), and additional information used in T-Mobile’s own credit assessments, Legere wrote in announcing the breach Thursday.

Experian is the company that Premera used to offer two years of free credit monitoring to the 11 million people affected by a cyberattack against the health insurer.

“Obviously, I am incredibly angry about this data breach, and we will institute a thorough review of our relationship with Experian, but right now my top concern and first focus is assisting any and all consumers affected,” Legere said.

He said his company’s systems and network were not part of the breach and that it does not involve payment card numbers or bank information.