https://www.bleepingcomputer.com/news/security/t-mobile-detects-and-stops-ongoing-security-breach/

T-Mobile USA announced a security breach late last night. The company says its cyber-security team discovered and shut down unauthorized access to its customers' data on Monday, August 20.

The telco says an attacker was exfiltrating personal data such as customer names, billing ZIP codes, phone numbers, email addresses, account numbers, and account types (prepaid or postpaid).