4m China Chongqing mobile customer

In 2020, the Chongqing Mobile 454 Million Full Database (\454万全库.mdb\) was leaked. The database contained highly sensitive personal information of over 4.5 million individuals, including names, addresses, phone numbers, email addresses, and more.

The leak was discovered by cybersecurity researchers at Comparitech, who purchased the database from a dark web marketplace. The researchers confirmed the authenticity of the database by comparing it to other publicly available data sets.

The leak was a significant data breach, and it raised serious concerns about the security of personal data in China. Chongqing Mobile is one of the largest mobile phone operators in China, and the leak exposed the personal information of a significant portion of its customer base.

The leak also highlighted the importance of data protection regulations. In the wake of the leak, the Chinese government announced new regulations that would strengthen data protection and privacy in the country.