SK Telecom said on the 27th that it ranked No. 1 for the 29th straight year in the mobile phone service institutional sector of the 2026 National Customer Satisfaction Index (NCSI) survey, selected by the Korea Productivity Center. Since NCSI was introduced in Korea in 1998, SK Telecom is the only company across all domestic industries to have held the top spot every year without exception.
NCSI is an index that quantifies customer satisfaction with products and services based on direct evaluations by consumers. SK Telecom said its AI-centered improvements to telecommunications services and, after last year's cyber intrusion incident, its efforts in customer protection, stronger network security, and rebuilding trust were recognized.
SK Telecom has made on-site communication a core task this year to restore customer trust. It implemented a "visiting service" that provides security and telecommunications training to 71 counties nationwide, recording 187 activities in the first quarter alone, 1,000 hours of customer support, and 24,875 km of travel.
It will also expand the roles of the Customer Trust Committee and a 100-member customer advisory group. The plan is to reflect feedback from the field in products, services, and policies.
The industry sees competition in telecommunications quality expanding from a focus on rates and speed to areas of everyday safety such as security, AI counseling, and phishing blocking. Customer satisfaction is also shifting toward valuing incident response and trust recovery capabilities over simple quality.
SK Telecom blocked about 1.1 billion attempted telecom frauds last year, including voice spam and voice phishing. It applied caller prediction, risky call warnings, and in-call voice phishing detection features to "adot Phone." SK Broadband also ranked No. 1 for the 16th straight year in the high-speed internet and IPTV institutional sectors.
Jung Jai-hun, president of SK Telecom, said, "We will continue fundamental service innovation by listening closely even to the smallest voices of our customers."