Inside the SK Telecom Data Breach: What Happened and What Companies Can Learn

In April 2025, SK Telecom—South Korea’s largest mobile carrier—formally notified regulators of a significant data breach that compromised sensitive SIM card data belonging to nearly 27 million users. Following an investigation, the Ministry of Science and ICT and the Korea Internet & Security Agency (KISA) concluded in July 2025 that SK Telecom was negligent in its account information management practices and in complying with its breach reporting obligations. As a result, the company was fined…
By: Alston & Bird