T-Mobile US said on Wednesday that an ongoing investigation into a cyberattack on its systems revealed that some of the personal data of about 7.8 million of its existing postpaid customers had been compromised.
The company was made aware of the attack late last week, it said in a statement, after an online forum claimed personal data of its users had been leaked.
T-Mobile said data for about 850,000 prepaid customers and more than 40 million records of former or potential customers were also stolen.
The breached data included information on customers’ first and last names, dates of birth, Social Security numbers and driver’s licenses, but there was no sign of their financial details being compromised.
The telecom operator on Monday acknowledged the data breach and said it was confident that the entry point used to access the data had been closed.
T-Mobile said it is taking “immediate steps” to protect users at risk. Here’s what the company said on the measures being taken:
As a result of this discovery, we are taking immediate steps to help protect all individuals who may be at risk from this cyberattack. A communication will be issued to customers shortly stating that T-Mobile is:
- Providing 2 years of free identity protection services immediately with McAfee’s ID Theft Protection Service.
- All T-Mobile recommends postpaid customers change their PIN by going online to their T-Mobile account or by calling our customer care team by dialing 611 on their phone. This caution is in spite of the fact that we are not aware that the PIN of any postpaid account was tampered with.
- Offering an extra step for postpaid customers to protect your mobile account with our account acquisition protection capabilities, making it harder for customer accounts to be fraudulently ported and stolen.
- Publishing a unique web page later on Wednesday for one stop information and solutions to help customers take further steps to protect themselves.
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