T-Mobile data breach exposes about 37 million accounts

FILE PHOTO: A T-Mobile logo is seen on the storefront door of a store in Manhattan, New York, U.S., April 30, 2018. REUTERS/Shannon Stapleton

(Reuters) -U.S. wireless carrier T-Mobile said on Thursday it was investigating a data breach that may have exposed 37 million postpaid and prepaid accounts, and hinted at incurring significant costs related to the incident.

It's the second major cyberattack in less than two years and comes months after the carrier agreed to upgrade its data security to settle a litigation related to a 2021 incident that compromised information of an estimated 76.6 million people.