Published by Global Banking & Finance Review®
Posted on April 28, 2025
2 min readLast updated: January 24, 2026
Add as preferred source on GoogleSK Telecom shares fell 8.5% after a data breach. The company offers free USIM replacements to 23 million users following the cyberattack.
SEOUL (Reuters) -SK Telecom shares fell as much as 8.5% on Monday to hit their lowest level since August last year, after South Korea's biggest mobile carrier disclosed it suffered a leak of customer data earlier this month caused by a cyberattack.
The company said in a statement it would take full responsibility for any harm caused as a result of the breach that was detected on April 18. It described the incident as a large-scale leak of data due to malware, without providing more details.
SK Telecom also said it would start offering free universal subscriber identity module (USIM) replacements to all 23 million users for free at more than 2,600 retail stores nationwide from Monday following the cybersecurity breach.
SK Telecom also urged customers to sign up for its USIM Protection Service, which it said provided the same level of prevention as replacing a USIM card.
About 5.54 million people had signed up for the service, accounting for nearly a quarter of SK Telecom's 23 million subscribers as of Sunday, according to the company.
SK Telecom shares closed down 6.7%, posting the biggest daily drop since March 2020, versus the benchmark KOSPI's 0.1% rise.
(Reporting by Heekyong Yang and Jihoon LeeEditing by Ed Davies)
The main topic is the data breach at SK Telecom and its impact on the company's shares.
The data breach was caused by a cyberattack involving malware.
SK Telecom is offering free USIM replacements to all affected customers.
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