T- Mobile’s hack will be investigated by a federal agency in the United States.

The Federal Communications Commission (FCC) in the United States announced late Wednesday that it will look into a data breach discovered by T-Mobile US Inc (TMUS.O) that affects more than 47 million current, past, and potential customers. Personal data, including social security numbers and driver’s license numbers, of more than 40 million former and potential customers, as well as data from 7.8 million current T-Mobile phone users, was taken, according to the third-largest U.S. telecom carrier.

Dates of birth, first and last names were also stolen, according to the telecom services provider, who added that no financial information had been touched. After U.S.-based digital media outlet Vice reported on a seller offering private data, including social security numbers, from a breach at T-Mobile servers, the firm, which had 104.8 million customers as of June, acknowledged the data breach on Sunday. 

T-Mobile (T.N) also revealed that the names, phone numbers, and account PINs of about 850,000 active T-Mobile prepaid customers were exposed.AT&T Inc (T.N) agreed to pay a $25 million fine to the Federal Communications Commission in 2015 to settle an investigation into consumer privacy violations at AT&T’s call centers.

According to Vice, the vendor stated that the breach exposed the personal information of 100 million people. For 6 bitcoin, or roughly $270,000, the seller was selling data on 30 million people. Poly Network is a decentralized finance (DeFi) network that supports peer-to-peer transactions with a focus on allowing users to move or trade tokens across different blockchains. It is a lesser-known name in the crypto world. On Tuesday, Poly Network revealed the hack, but the next day, the hackers said they had begun restoring the digital currency they had seized.

In digital letters released by Elliptic, the hackers said they carried out the attack for fun and that returning the tokens was always the goal. However, some blockchain experts believe they may have found it too difficult to launder stolen cryptocurrency on such a large scale.