T-Mobile customers’ phone numbers, call records exposed after data breach

US telecommunications giant T-Mobile has suffered a security breach that may have exposed call records and phone numbers for some of its customers.

According to T-Mobile, the data breach did not expose account holders’ names, physical addresses, email addresses, financial data, credit card information, social security numbers, tax IDs, passwords or PINs.

First reported by Bleeping Computer, T-Mobile said the breach exposed customers’ proprietary network information (CPNI), including phone numbers and call records.

“Customer proprietary network information (CPNI) as defined by the Federal Communications Commission (FCC) rules was accessed,” the company said in a security update.