T-Mobile isn't really saying a great deal about the incident other than trying to downplay its severity and impressing on customers that it acted quickly to stop the attack.
Credit cards, passwords, and social security numbers were not accessed, according to T-Mobile.
The cyber-security team found and shut down unauthorized access to certain information on August 20, and reported the matter to authorities, T-Mobile said in a statement t-mo.co/2wrr9Cq on its website.
The third most popular mobile network in the United States, T-Mobile, has suffered a data breach that affected more than two million of its customers.
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The company is in the process of notifying customers affected by the breach.
"However, you should know that some of your personal information may have been exposed, which may have included one or more of the following: name, billing zip code, phone number, email address, account number and account type (prepaid or postpaid)".
T-Mobile is informing customers of the breach "out an abundance of caution", but isn't viewing this as a major incident.
The alert doesn't mention the number of subscribers involved but this is being reported by Motherboard as just shy of 3%, or around 2.26 million accounts. For more information, you can contact customer care by dialing 611, using messaging on MyT-Mobile.com or the T-Mobile app, or use iMessage with Apple Business Chat. The breach was caused when "an worldwide group" of hackers accessed a server through an API which was said not to have any "very sensitive data" available through it.