SK Telecom begins SIM card replacement after data breach

South Korea’s largest carrier, SK Telecom, began replacing SIM cards for its 23 million customers on Monday following a serious data breach.

Instead of revealing the full extent of the damage or the perpetrators, the company has apologised and offered free USIM chip replacements at 2,600 stores nationwide, urging users to either change their chips or enrol in an information protection service.

The breach, caused by malicious code, compromised personal information and prompted a government-led review of South Korea’s data protection systems.

However, SK Telecom has secured less than five percent of the USIM chips required, planning to procure an additional five million by the end of May instead of having enough stock ready for immediate replacement.

Frustrated customers, like 30-year-old Jang waiting in line in Seoul, criticised the company for failing to be transparent about the amount of data leaked and the number of users affected.

Instead of providing clear answers, SK Telecom has focused on encouraging users to seek chip replacements or protective measures.

South Korea, often regarded as one of the most connected countries globally, has faced repeated cyberattacks, many attributed to North Korea.

Just last year, police confirmed that North Korean hackers had stolen over a gigabyte of sensitive financial data from a South Korean court system over a two-year span.

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