(Reuters) -T-Mobile US Inc. said on Friday that hackers had accessed the personal data of another 5.3 million wireless customers, increasing the scale of an intrusion that has affected millions of current, former and prospective customers.
The information includes the address, date of birth and telephone number of customers, the company said, adding that it had no indication that the accessible information contained financial information such as credit cards or other payment information.
"Our investigation is ongoing and will continue for some time, but at this time we are convinced that we have turned off access," the company said in a legislative application.
The third largest US wireless operator said earlier this week that personal data of more than 40 million former and potential customers were stolen along with data from 7.8 million existing T-Mobile wireless customers.
However, T-Mobile revealed on Friday that it had identified 667,000 more accounts for previous customers, whose names, phone numbers, addresses and dates of birth were accessible by hackers.
T-Mobile also stated that the infringing data for a further 5.3 million postpaid users did not include any social security or driving license data.
The company's update comes after the US Federal Communications Commission said on Wednesday that it would investigate the data breach.
The company reiterated that it has no indication that the information contained the customer's financial information, credit card information, debit card or other payment information. [1