T-Mobile claims that hackers compromised 40 million customer records.

A security investigation uncovered that almost 40 million customers' data, including personal social security cards and driver's licence information, was stolen, T-Mobile US Inc said on Wednesday.

Data seized in the attack contained personal information for seven and a half million T-Mobile customers.

According to the telecom services provider, the dates of birth, first and last names, and other personal information were also stolen, who added that there was no sign that their financial information had been hacked.

Following an article by U.S.-based digital media source Vice that announced a vendor had made an offer on an underground forum to sell personal data from a T-Mobile hack, the firm publicly disclosed the incident on Sunday.

According to Vice, the vendor stated that the breach exposed the personal information of 100 million people. Around the time, the data set on 30 million persons, valued at $270,000, was being offered for six bitcoins, or roughly $230,000.

The asking price has allegedly fallen, and the complete data was available for $200.

Another high-profile cyberattack occurred after T-Mobile was hacked due to increased security being compromised due to work-from-home rules in the wake of the COVID-19 epidemic.

The cryptocurrency network Poly Network suffered a cyberattack earlier this month, losing $610 million in total. Afterwards, the company handed the hackers $500,000 as a "bug bounty."