T-Mobile has announced a data breach exposing customers’ proprietary network information (CPNI), including phone numbers and call records. The information exposed in this breach includes phone numbers, call records, and the number of lines on an account. The data breach did not expose account holders’ names, physical addresses, email addresses, financial data, credit card information, social security numbers, passwords, PINs or physical or email addresses. The breach affected a “small number of customers (less than 0.2%)”””
Source: https://www.bleepingcomputer.com/news/security/t-mobile-data-breach-exposed-phone-numbers-call-records/