T-Mobile claims hackers have stolen personal data from around 7.8 million customers

T-Mobile US said on Wednesday that an ongoing investigation into a cyber attack on its systems revealed that some personal data from about 7.8 million of its current postpaid customers had been compromised.

The company became aware of the attack last week, it said in a statement, after an online forum alleged that its users’ personal data had been leaked.

Data from nearly 850,000 prepaid customers and more than 40 million records of past or potential customers were also stolen, T-Mobile said.

The breached data included the customers’ first and last names, date of birth, social security number, and driver’s license information, but there was no indication that their financial data had been compromised.

The telecom operator acknowledged the data breach on Monday and said it was confident 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 about the steps 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 cyber attack. Communications will be issued shortly to customers highlighting that T-Mobile is:

  • Immediately offering 2 years of free identity protection services with McAfee’s Identity Theft Protection Service.
  • Recommend all T-Mobile postpaid customers to proactively change their PIN by logging into their T-Mobile account online or by calling our Customer Service team by dialing 611 on their phone. This precaution comes despite the fact that we are not aware that postpaid account PINs have been compromised.
  • Giving you an extra step to protect your mobile account with our account theft protection features for postpaid customers, making it harder for customer accounts to be fraudulently ported and stolen.
  • An exclusive webpage published on Wednesday with complete information and solutions to help customers take steps to further protect themselves.

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