In the latest attack on the mobile operator T-Mobile US, the hackers got hold of the data of millions of customers.
The information disclosed included names, social security numbers as well as birth and driver's license data of current and previous customers, announced the subsidiary of the Dax group Deutsche Telekom on Wednesday.
Financial information such as credit card numbers or passwords are not included.
According to the information, the stolen data set contained information from around 7.8 million contract customers as well as from around 40 million previous or potential customers and around 850,000 customers with credit accounts.
The data leak has now been closed.
T-Mobile US asked customers to change their passwords and PINs.
T-Mobile US had started investigations after reports of a suspected hacker attack.
Previously, a message was posted in an online forum that the personal data of more than 100 million users had been obtained.
According to its own information, T-Mobile US has a little over 100 million customers.
In the past few months, there has been an increasing number of hacker attacks around the world. For example, criminals stole an estimated hundreds of millions of dollars in an attack on the decentralized crypto platform Poly Network. The American government has urged companies to invest more in security.