T-Mobile US reported another security breach last week, marking the second such incident during the course of 2020. T-Mobile (TMUS) announced that it has discovered unauthorized access to some of its customers’ account information. According to the telecommunication giant, hackers accessed customer proprietary network information (CPNI), through which they might have obtained its customers’ phone number and their call-related information data. However, the company said that “the data accessed did not include names on the account, physical or email addresses, financial data, credit card information, social security numbers, tax ID, passwords, or PINs.