In a statement T-Mobile said, it is investigating a claim made on an online forum which states that personal data of more than 100 million users have been hacked.

“We are aware of claims made in an underground forum and have been actively investigating their validity. We do not have any additional information to share at this time,” said a T-Mobile spokesperson in a statement.

According to the report in Vice’s Motherboard, although the post in the forum does not mention T-Mobile, the hacker told Vice they have obtained data of over 100 million people which came from T-Mobile’s servers.

The breached data includes information such as names, physical addresses, social security numbers, phone numbers, and driver license information.

In the online forum, the hacker demanded payment of 6 bitcoin for a subset of the data containing 30 million social security numbers and driver licenses; the rest of the data is being sold privately, according to the report from Vice.