Aug 16: First reported by Bleeping Computer, T-Mobile said the breach exposed customers' proprietary network information (CPNI), including phone numbers and call records.
Earlier breaches at T-Mobile exposed customers' information in 2018, prepaid customers' information in 2019 and exposed customer and financial data in March last year, the report mentioned.
T-Mobile said the fresh breach affected a "small number of customers (less than 0.2 per cent)."
T-Mobile has approximately 100 million customers, which equates to around 200,000 people affected by this breach.
A March 2020 breach exposed some T-Mobile customers' financial information, Social Security numbers, and other account information.