SK Telecom took the top spot in the mobile phone service category for the 29th consecutive year in the 2026 National Customer Satisfaction Index (NCSI) survey selected by the Korea Productivity Center.

The NCSI is an index that quantifies satisfaction levels directly assessed by consumers for products or services sold in South Korea. SKT has ranked No. 1 every year since the NCSI was introduced in South Korea in 1998. SKT is the only company to do so across all domestic industries.

SKT said the No. 1 ranking reflected recognition of its efforts to improve AI-centered telecom services, along with steps to strengthen customer protection and network security after a cyber intrusion incident last year and activities to restore customer trust.

SK Broadband was also selected as No. 1 for the 16th straight year in the high-speed internet and IPTV categories. It attributed the result to continued efforts to innovate customer value, including collecting feedback from about 5,000 customers each month and running companywide meetings chaired by the chief executive officer.

SKT has made on-site communication a key task this year to restore customer trust. The CEO and employees are identifying areas for improvement through in-person communication with customers and applying changes at customer touchpoints. The Customer Trust Committee launched in May last year plans to support efforts so systematic trust restoration can continue. It will also expand the role of its 100-member customer advisory group.

SKT also assessed that high evaluations reflected its customer protection efforts, including strengthening network security using AI and advancing technology to block spam and voice phishing. SKT blocked about 1.1 billion attempted telecom fraud cases last year, including voice spam and voice phishing calls.

SK Broadband is also accelerating customer convenience innovation by applying AI technology. Its AI chatbot, ChatB, has been upgraded so customers can handle about 93 percent of consultation inquiries through self-service. Cumulative uses of its AI media agent, B tv A-dot, surpassed 100 million as of December last year.

SKT CEO Jae-heon Jung (정재헌) said, "This No. 1 record in the National Customer Satisfaction Index is more precious and valuable than in any other year." He added, "We will not be complacent with the result, and we will continue fundamental service innovation that customers can feel by carefully listening even to small voices from customers."