SK Telecom (NYSE: SKM) announced that it had signed a strategic partnership and investment agreement with TimeTree, a global schedule-sharing platform company, on September 5 to jointly develop AI agent services. TimeTree operates a schedule-sharing application, also called ‘TimeTree,’ which has approximately 67 million users worldwide and is growing rapidly. Through this strategic partnership, SK Telecom is planning to leverage its AI agent technologies and commercialization expertise — built through the operation of ‘A.’ (A-DoT) — and apply them to TimeTree. This includes the 'Agentic Workflow,' which was -implemented in A. in August 2025. The partnership marks the first application of SK Telecom’s AI agent technology to an overseas service. Agentic Workflow is a method in which an AI agent goes beyond simply executing a user’s request: it sets goals based on the user’s activity history and sequentially plans and executes the necessary steps. The framework is widely acknowledged in the industry as a key method for enhancing AI agent performance. SK Telecom plans to implement features such as proactive recommendations, and personalized calendar management in the TimeTree app. Looking ahead, the company aims to evolve the service into an active AI platform capable of suggesting optimized activities and events tailored to users’ schedules, usage patterns and preferences. In addition, SK Telecom will invest JPY 2.2 billion in TimeTree. The company views TimeTree’s extensive data assets and global user base as crucial resources for advancing its AI agent services and expanding into overseas markets. Through this investment, SK Telecom aims to establish a strong strategic foothold in the global AI market. “The essence of TimeTree’s AI agent is to use schedules as natural action triggers. SK Telecom recognized both our unique approach and the value of our 67-million-user dataset, making SK Telecom not only our lead investor but also a true strategic partner,” said Chajin Park, CEO of TimeTree. “This alliance marks a turning point as we expand from Japan to Korea and beyond, leading a new paradigm of schedule-centered AI.” “Partnering with TimeTree offers SK Telecom a powerful opportunity to extend our AI agent technologies into global markets,” said Ryu Young-sang, CEO of SK Telecom. “Together, we will expand the AI ecosystem across Korea, Japan and beyond.”

SK Telecom (NYSE: SKM) announced that it has signed a comprehensive integrated procurement agreement with Schneider Electric for mechanical, electrical and plumbing (MEP) equipment and solutions to support the establishment of the ‘SK AIDC in Ulsan.’ Schneider Electric is a global leader in MEP equipment for artificial intelligence data centers (AIDCs), offering comprehensive integrated infrastructure solutions that cover everything from design and construction to operations. The agreement between SK Telecom and Schneider Electric marks the first tangible outcome of the partnership announced at Mobile World Congress 2025 (MWC25) in March. Under the agreement, Schneider Electric will supply MEP equipment across five categories, including switchgear, Uninterruptible Power Supply (UPS), transformers, and automated control systems, for the SK AIDC in Ulsan. SK Telecom will integrate Schneider Electric’s Electrical Transient Analyzer Program (ETAP) solution, a leading digital twin software for power systems that spans design, analysis and operation stages, into its unified AI Data Center Infrastructure Management (DCIM) system. This will allow SK Telecom to pursue digital twin-based operational optimization. The AI DCIM platform provides software and tools for real-time monitoring and management of power consumption and infrastructure utilization. Through this integration, SK Telecom aims to maximize data center operational efficiency and further enhance the capabilities of its AI DCIM solution. Since announcing their partnership in March, SK Telecom and Schneider Electric have formed a working group and have been actively collaborating on multiple areas, including: ŸSKT AI DCIM & Schneider Automated Control Systems:Pursuing the integration and commercialization of SK Telecom’s unified AI DCIM with Schneider Electric’s automated control systems. ŸMEP Reference Designs:Developing MEP reference designs and jointly executing data center design and construction services. ŸPrefabricated Solutions:Creating prefabricated and integrated solutions to significantly reduce construction timelines. ŸEnergy-as-a-Service (EaaS):Expanding collaborative sales initiatives to grow their EaaS business. The two companies also signed a Memorandum of Understanding (MoU) to broaden their collaboration across the SK Group. Based on this agreement, the two companies will collaborate on the joint development of Schneider Electric’s Uninterruptible Power Supply (UPS) and Energy Storage System (ESS), leveraging SK On’s Lithium-ion battery technologies. They intend to leverage the collective demand of MEP equipment across SK Group affiliates to drive further cooperation. “This collaboration marks a significant milestone in setting a new standard for AI data centers by leveraging the combined technological expertise and know-how of both companies. Schneider Electric remains committed to working closely with SKT to build a sustainable and efficient next-generation data center ecosystem,” said Pankaj Sharma, Executive Vice President and Head of Secure Power and Services at Schneider Electric. “The procurement agreement and the expansion of our strategic cooperation are part of SK Telecom’s AI pyramid strategy of ‘self-reliance and cooperation,” said Ryu Young-sang, CEO of SK Telecom. “Our partnership with Schneider Electric and the deepening of this strategic collaboration are expected to not only to support the construction of the Guro AIDC and the gigawatt-scale expansion of the SK AIDC in Ulsan, but also to create synergies across the SK Group affiliates, driving mutual growth at the highest-level.”

SK Telecom (NYSE: SKM) today announced its earnings for the second quarter of 2025 based on a Korean International Financial Reporting Standards (K-IFRS) on a consolidated basis: revenue of KRW 4.3388 trillion, operating income of KRW 338.3 billion, and net income of KRW 83.2 billion. The decrease in operating income and net income, down 37.1% and 76.2% year-over-year (YoY), respectively, was attributed to one-time costs, including customer SIM card replacements and retail stores’ loss compensation. On a non-consolidated basis, the company reported revenue of KRW 3.1351 trillion, with operating income of KRW 250.9 billion and net income of KRW 36.9 billion. AI business recorded a 13.9% growth, long-term growth to be powered by new AIDC SK Telecom’s artificial intelligence (AI) business grew 13.9% year-over-year (YoY), driving Q2 results. The AI data center (AIDC) business posted revenue of KRW 108.7 billion, up 13.3% from the same period last year, driven by improved utilization. The AI Transformation (AIX) business grew 15.3% to KRW 46.8 billion in revenue, bolstered by expanding B2B solutions sales. In June, SK Telecom announced a joint plan with Amazon Web Services (AWS) and SK Group affiliates to build a data center in Ulsan, South Korea for a new AWS AI Zone. The Ulsan AIDC, set to begin operations in 2027, will leverage SK Groups’ capabilities and serve as a key hub in the ‘AI Infrastructure Superhighway,’ SK Telecom’s plan for establishing AI infrastructure to become an AI hub in Asia Pacific region. Once in operation, the Ulsan AIDC, in conjunction with the Guro DC in Seoul, will bring SK Telecom’s total data center capacity to over 300 MW. SK Telecom expects to achieve an annual revenue of more than KRW 1 trillion from AIDC business by 2030. ‘Accountability and Commitment Program’ boosts customer data protection In response to the recent cybersecurity incident, SK Telecom has launched the ‘Accountability and Commitment Program,’ which focuses on rebuilding customer trust through enhanced customer protection and information security measures. The program includes the ‘Customer Assurance Package’ to prevent customer damage, a KRW 700 billion investment over the next five years to enhance the information protection system, and the ‘Customer Appreciation Package’ to acknowledge and thank customers for loyalty. As part of the Customer Assurance Package, SK Telecom has completed the enrollment of all customers in the SIM card protection service and is offering free SIM card replacements. Additionally, the Fraud Detection System (FDS) has been upgraded to its highest level. In addition, SK Telecom is introducing a ‘Cybersecurity Compensation Guarantee System’ to support the compensation process for customer damage caused by SIM cloning. The company will also provide ZIMPERIUM, a top-tier global mobile device security solution, free of charge for all customers for one year. SK Telecom also unveiled its ‘Information Protection Innovation Plan,’ aiming to build a world-class information security system based on Zero Trust, a comprehensive security model that continuously verifies all access and grants the least amount of access. SK Telecom plans to invest KRW 700 billion in information protection over the next five years. To express gratitude and rebuild customer trust, SK Telecom launched the Customer Appreciation Package, offering a range of benefits, including a 50% discount on the monthly bill for August 2025, an additional 50 GB of data every month until the end of the year, and enhance the discount benefits with various T Membership partners. This package is totaled at KRW 500 billion in value. Additionally, the company plans to enhance customer satisfaction by introducing a policy that reinstates customers’ original benefits — including years of service and membership status — if they rejoin SK Telecom within six months.Those who do not rejoin within this period may apply for the restoration program on the T World website, with benefits restored if they rejoin within three years of application. SK Telecom emphasized rebuilding customer trust as its highest priority. The company is closely reflecting customer feedback as well as recommendations from both the Customer Trust Committee and the Information Security Innovation Committee. Based on this foundation, SK Telecom plans to not only reinforce its core telecommunication business but also steadily advance its monetization of AI. “We are taking a hard look at the cybersecurity incident and are committed to rebuild our business thoroughly and transparently,” said Kim Yang-seob, CFO of SK Telecom. "We ask for our customers’ continued support and trust as we move forward with changes in rebuilding SK Telecom.” ※Attachment 1.Summary of Consolidated Income Statement(Unit: KRW billion) Type 25.2Q 24.2Q YoY 25.1Q QoQ Revenue 4,339 4,422 △1.9% 4,454 △2.6% Operating Income 338 538 △37.1% 567 △40.4% Net Income 83 350 △76.2% 362 △77.0% ※Attachment 2.Summary of Non-Consolidated Income Statement(Unit: KRW billion) Type 25.2Q 24.2Q YoY 25.1Q QoQ Revenue 3,135 3,192 △1.8% 3,167 △1.0% Operating Income 251 450 △44.3% 482 △48.0% Net Income 37 280 △86.8% 475 △92.2%

SK Telecom (NYSE: SKM) announced the launch of its new sovereign AI Infrastructure, providing GPU-as-a-Service (GPUaaS) based on the latest NVIDIA Blackwell GPUs. The newly launched platform features one of Korea’s largest GPU clusters, consisting of over 1,000 NVIDIA BlackwellGPUs integrated into a single cluster. It delivers state-of-the-art performance in Korea and represents an advancement over the NVIDIA H100 Tensor Core GPU-based GPUaaS released in December 2024. It is expected to contribute significantly to nationwide AI infrastructure expansion and the growth of the Korean AI industry. The cluster is named "Haein" (해인, 海印), inspired by Haeinsa Temple, where the Tripitaka Koreana (a UNESCO World Heritage collection of over 80,000 Buddhist scriptures) is stored. The name reflects the intention to establish this cluster as a key part of Korea’s sovereign AI infrastructure. In particular, this Haein Cluster has secured a role in the Ministry of Science and ICT’s program for enhancing the foundation of AI computing resource utilization as part of “Proprietary AI Foundation Model” Project. It will actively contribute to the development of national AI foundation models with global competitiveness. The AI Foundation Model program aims to strengthen Korea’s AI competitiveness on the global stage and advance the national AI ecosystem. Through this program, SK Telecom plans to develop its Gasan AI data center (AIDC) into a core infrastructure hub for the growth of Korea’s AI industry. SK Telecom has prepared for this sovereign AI infrastructure launch with strategic global partnerships, which include Penguin Solutions for integrated AIDC solutions and Supermicro for globally sourced AI server procurement. Also, SK Telecom’s proprietary technologies are being leveraged in various ways. By utilizing its in-house virtualization solution, “Petasus AI Cloud,” SK Telecom can instantly partition and reconfigure the GPU cluster according to customer needs, maximizing its utilization. In addition, the company provides “AI Cloud Manager,” an AIOps (AI for IT Operations) platform that efficiently manages the entire AI service lifecycle—from development and training to deployment. This platform, backed by extensive expertise in large-scale model development, enhances user work efficiency and development convenience. This launch of Blackwell-based GPUaaS marks another tangible milestone following the opening of Lambda’s Korea region in December 2024. SK Telecom will continue to expand its GPUaaS business to provide strong infrastructure support that enables Korea’s AI industry to compete on the global stage. “Haein Cluster’s GPUaaS will serve as a catalyst for enhancing both customer and national AI competitiveness,” said Kim Myoung Gook, head of GPUaaS Business Office at SK Telecom. “As an AI infrastructure provider, we are committed to building the nation’s AI superhighway.”

SK Telecom (NYSE: SKM) today announced that the SKT Consortium has been selected as a core team for the ‘Proprietary AI Foundation Model’ project led by the Ministry of Science and ICT (MSIT). As part of this initiative, the SKT Consortium aims to develop a full-stack artificial intelligence (AI) platform based on proprietary technologies spanning semiconductors, models, data and services. A significant aspect of this effort will include open-sourcing these capabilities to empower domestic companies and accelerate Korea’s AI innovation ecosystem. The SKT consortium brings together industry leaders and research institutions across Korea to establish a solid foundation for proprietary AI advancement. Kim Taeyoon, Head of the Foundation Model Office at SK Telecom, will conduct core research on AI technologies. The main participating companies and research institutions include: • Krafton:Korea’s largest listed game company, known for iconic game franchises. • 42dot:A leader in mobility AI solutions aimed at advancing autonomous technologies. • Rebellions:A top-tier manufacturer of AI inference chips (neural processing units, or NPUs). • Liner:A specialist in AI-driven knowledge and search agent technologies. • Selectstar:A provider of data reliability technologies critical to AI model development. • Seoul National University (SNU):Professor Kim Gunhee, Professor Yoon Sungroh, Professor Hwang Seungwon, Professor Do Jaeyoung • Korea Advanced Institute of Science and Technology (KAIST):Professor Lee Kimin In addition, Professor Lee Kangwook and Professor Dimitris Papailiopoulos from the University of Wisconsin-Madison have joined as key researchers in this project, further strengthening the consortium’s AI research capabilities. The SKT Consortium has demonstrated its expertise in the AI field, with over 800 research papers, 736 patents, and 270 open-source projects. Image: Full-stack AI concept map of SKT Consortium SK Telecom is embarking on the development of next-generation large-scale AI models through the Proprietary AI Foundation Model project. The company plans to incorporate ‘omni-modal’ technology, enabling the integrated processing of not only text, but also images, speech and video data. Since 2018, SK Telecom has been developing its own large language model (LLM), A.X. This year, the company has sequentially released two versions (standard and light) of the A.X 4.0 based on large-scale continual pre-training (CPT), as well as two versions (standard and light) of the A.X 3.1 built entirely from scratch. These models deliver performance on par with GPT-4o and demonstrate world-class ability in understanding Korean context. To date, SK Telecom has trained A.X models on its own TITAN supercomputer. Moving forward, the SKT Consortium will provide large-scale computing resources independently to conduct advanced research and development. In addition, consortium member Rebellions will leverage its domestically developed NPUs to optimize high-performance, energy-efficient AI services. The consortium’s ultimate objective is to make AI agents accessible and convenient for all Koreans, while leading AI innovation across key industries such as office work, manufacturing, automotive, gaming and robotics. “With our proven technological capabilities and operational expertise, we will deliver the highest-quality Korean-style proprietary AI foundation model to empower AI for daily life in Korea,” said Kim Jiwon, Head of AI Model Lab at SK Telecom.

SK Telecom (NYSE: SKM) announced the release of its new proprietary standard large language model (LLM), ‘A.X 3.1’, on the open-source community Hugging Face on July 24. The newly released A.X 3.1 standard model has 34 billion parameters. SK Telecom developed it from scratch, covering all stages of the process, including model design and data training. The A.X 3.1 standard is a major upgrade over A.X 3.0. While the previous version focused on Korean conversational tasks, the A.X 3.1 significantly improves coding and mathematical reasoning to enable future expansion into advanced inference and complex problem-solving. With this, SK Telecom has open-sourced a total of four A.X models: two A.X 3.1 models (standard and light) and two large-scale A.X 4.0 models (standard and light). These models are freely available for academic research and commercial use. The A.X 3.1 standard has less than half the number of parameters compared to A.X 4.0 standard, but when applied to the same Korean-language service, it deliversapproximately 90% of the performance. Therefore, users can choose between A.X 3.1 and A.X 4.0 depending on their environment and needs. In Massive Multitask Language Understanding in Korean (KMMLU), a comprehensive benchmark for assessing Korean language proficiency — especially for large-scale multitask language understanding — the A.X 3.1 standard (69.20) achieved approximately 88% performance compared to the benchmark score of A.X 4.0 standard (78.3). In Cultural and Linguistic Intelligence in Korea (CLIcK), a benchmark focused on Korean language and cultural understanding, the A.X 3.1 (77.1) demonstrated performance of approximately 90% compared to the benchmark the A.X 4.0 standard (85.7). Dual-track strategy: in-house-developed A.X 3 and large-scale-trained A.X 4 models SK Telecom is enhancing its LLM capabilities through a dual-track strategy. The A.X 3 series represents a sovereign AI model, fully developed in-house, emphasizing self-sufficiency, while the A.X 4 series focuses on LLMs optimized for the Korean business environment. The A.X 4 series achieves this optimization by applying large-scale continual pre-training (CPT) with Korean data to open-source models. On July 3, SK Telecom open-sourced both the standard model with 72 billion parameters and the light model with 7 billion parameters of the A.X 4.0 on Hugging Face. The A.X 4.0 demonstrates advanced Korean language processing efficiency, outperforming many existing LLMs in the market. It has also been effectively applied to SK Telecom’s A. call summarization service since May. According to internal testing, the A.X 4.0 standard achieved approximately 33% higher token efficiency than GPT-4o when processing the same Korean input. It also scored 78.3 on KMMLU, and 85.7 on CLIcK, surpassing GPT-4o’s scores of 72.5 and 80.2, respectively, in understanding Korean culture. SK Telecom began developing AI LLMs in 2018, applying KoBERT, a Korean BERT pre-trained model, to its customer service chatbots in 2019. In 2020, SK Telecom became the first company in Korea to develop and open-source GPT2 in Korean. In 2022, the company launched A., incorporating the in-house-developed A.X LLM model, which enabled open-domain conversations. Through this dual-track strategy, SK Telecom aims to provide Korean companies with a diverse range of AI tools tailored to their specific needs. The company also plans to significantly enhance model performance by expanding its GPU resources and strengthening its development capabilities. Building on its cutting-edge LLM capabilities, SK Telecom has formed a consortium to participate in the government’s Proprietary AI Foundation Model project. The SKT consortium aims to implement a full-stack AI based on its own technologies spanning semiconductors, models, data, and services, and to open source the developed models to various companies within the domestic AI ecosystem. “With a consortium that brings together SK Telecom’s proprietary development capabilities and the expertise of leading companies in each field, we will create new achievements in the field of sovereign AI. We also plan to unveil innovative AI models holistically designed to address all aspects of the domestic AI ecosystem,”said Kim Tae-yoon, Head of Foundation Model Office at SK Telecom.

SK Telecom acknowledges the findings of the joint public-private investigation and expresses its deep regret regarding the cybersecurity incident. We sincerely apologize to our customers and to society for the inconvenience and concern this incident has caused, and we are committed to taking all necessary steps to ensure this does not happen again. To reiterate its commitment and rebuild customer trust, SK Telecom is announcing theAccountability and Commitment Program, consisting of the Customer Assurance Package, Information Protection Innovation Plan, Customer Appreciation Package and Subscription Cancellation Fee Waiver. TheCustomer Assurance Package, introduced following the cybersecurity incident, will be enhanced to provide robust protection and prevent harm to SK Telecom customers. SK Telecom remains steadfast in its commitment to taking full responsibility for safeguarding our customers in the aftermath of the incident, continuing this dedication until all concerns are fully addressed. To address cybersecurity concerns and strengthen customer confidence, SK Telecom is launching theInformation Protection Innovation Plan, investing KRW 700 billion over the next five years to build a world-class information protection system. This initiative will be guided by the U.S. National Institute of Standards and Technology’s (NIST) Cybersecurity Framework (CSF), and will align with the highest cybersecurity standards. SK Telecom aims to lead Korea in cybersecurity by 2028 and establish a globally recognized security system within five years. As a gesture of gratitude for the trust and patience shown by our customers during this challenging time, SK Telecom is also launching theCustomer Appreciation Packageto acknowledge and thank our customers for their loyalty. Moving forward, SK Telecom remains firmly committed to delivering meaningful value that resonates with all customers and will continue to strive to provide dependable, quality services. SK Telecom Customer Assurance Package SK Telecom introduced the Customer Assurance Package right after the cybersecurity incident to prevent secondary damage prior to the Information Protection Innovation Plan. 1. SIM Protection Service ● all customers via MMS and can also be found on the dedicated information page. ● It links the customer’s SIM card and device, preventing the use of stolen SIM information on another device, even if the SIM is cloned by an attacker. ● The service was automatically provided to all customers, with special consideration for customers less familiar with digital technology. It was also enhanced to block unauthorized access to SIM card information for customers overseas. 2. FDS 2.0 ● Fraud Detection System (FDS) 2.0 was deployed to the system on May 18. ● FDS 2.0 is an advanced multi-authentication system that cross-references unique SIM card and device characteristics for a comprehensive review. ● The system has been enhanced to not only block network access from unauthorized SIM cards but also to prevent access from illegally cloned devices. 3. SIM Card Replacement ● SIM replacement was offered to all customers. ● Starting April 28, 2025, SK Telecom began offering a one-time free SIM replacement — whether a physical SIM card, eSIM or SIM reset — according to each customer’s preference. ● On May 12, SK Telecom developed SIM Reset, a solution that enables software-based changes to the authentication information of a SIM card without requiring a physical SIM replacement (a one-time free SIM replacement remains available after the SIM Reset). ● As of June 19, SK Telecom successfully completed all SIM replacements for 9 million customers who had made reservations. For even greater customer protection, SK Telecom is announcing plans for the Enhanced Customer Assurance Package. 4. Mobile Device Security Solution ● SK Telecom will offer all customers with ZIMPERIUM, a top-tier global mobile device security solution used by military organizations, governments and telecommunication companies, free of charge for one year to protect against the latest cybersecurity threats. ● ZIMPERIUM is a global leading mobile security solution ● This solution is available to all customers subscribed to SK Telecom. ● The solution is scheduled to be rolled out in the second half of 2025 after preparation. 5. Cybersecurity Compensation Guarantee System ● SK Telecom will introduce a system where an external organization supports the compensation process for customer damage caused by SIM cloning, in accordance with applicable laws, terms and the findings of the investigation. 6. Coverage Limit for Cybersecurity Corporate Insurance ● SK Telecom will raise the coverage limit from KRW 1 billion to KRW 100 billion, establishing a system capable of providing compensation for potential cybersecurity incidents in the future, subject to the terms and conditions of the insurance policy. SK Telecom Information Protection Innovation Plan SK Telecom is making the largest investment in the telecommunications industry to elevate its information protection system to global top-tier standards. 1.Investment ● SK Telecom plans to invest KRW 700 billion over five years to expand security teams, improve systems and elevate information protection to top-tier standards. ● The company plans to double its information protection team by hiring industry experts and developing in-house talent. ● To support the growth of the Korean information protection industry, SK Telecom will establish a KRW 10 billion fund to strengthen Korea’s cybersecurity industry. The fund is planned to be used for fostering talent in collaboration with prestigious universities specializing in information security, operating industry-academic partnership programs, and supporting the discovery and development of promising information security startups. 2.Governance ● SK Telecom will reorganize the Chief Information Security Officer role to report directly to the CEO, strengthening its responsibilities within the company. Also, the board of directors will include cybersecurity expert to ensure stronger security decision-making and execution at the executive level. ● To proactively address security vulnerabilities from the attackers’ perspective, SK Telecom will establish a Red Team, tasked with continuously checking and improving security vulnerabilities, building a practical and proactive security system. 3.Zero Trust-based Information Protection System ● Zero Trust is a comprehensive security model that continuously verifies all access and grants the least amount of access. It is applied to various technologies and operational processes, including strict authentication and authorization management, network segmentation, AI-based integrated security monitoring and data encryption. 4.ISMS-P Certification and Internal/External Cybersecurity Validation System ● To strengthen personal information protection, SK Telecom will expand the scope of its Personal Information & Information Security Management System (ISMS-P) certification to include telecommunications infrastructure and enterprise-wide systems, beyond key business systems and major telecommunications and IT services. ● In line with public institution obligations, SK Telecom will proactively adopt a personal information impact assessment system to ensure the security of the personal information handling process. ● Internal development and operation process will be designed with a focus on personal information protection. SK Telecom is also advancing R&D efforts through industry-academia collaboration to develop next-generation information security technologies. In addition, SK Telecom plans to gather customer feedback through a public participation project that solicits ideas for personal information protection. ● SK Telecom will work closely with the Special Committee for Information Protection Innovation established in May 2024 to actively validate the company-wide security level and conduct simulated hacking exercises with internationally recognized white-hat hackers to address vulnerabilities. (Reference: SK Group established an independent advisory body, The Special Committee for Information Protection Innovation, consisting of industry and academic experts in personal information protection and cybersecurity, in May 2024. Customer Appreciation Package The Customer Appreciation Package will be available to all SK Telecom customers from July 15 to December 31, 2025. SK Telecom plans to offer a range of programs totaling KRW 500 billion in value to all 24 million customers who use SK Telecom and MVNO networks. 1. Monthly bill discount and additional data for August ● All eligible customers will automatically receive a 50% discount on the monthly bill for August 2025. ● All eligible customers will automatically receive an additional 50 GB of data every month, from August 1 to December 31, 2025. ● SK Telecom plans to discuss with MVNO operators that use SK Telecom network service to provide 50% discount on the monthly bill (including subscription fee and text/voice call/data fee) for August for MNVO users. The actual application of these benefits to MVNO users may vary depending on the outcome of such discussions and relevant agreements. 2. Enhanced T Membership Benefits ● From August through the end of 2025, SK Telecom will enhance the discount benefit to 50% and above at its T Membership program, enabling customers to enjoydiscounts at various T Membership partner companies. ● Customers who newly subscribe to SK Telecom can receive the same benefit as existing customers. 3. Benefits for Returning Customers ● Customers who canceled their subscription after the cybersecurity incident may have theiroriginal benefits, including years of service and membership status,restored upon rejoining SK Telecom, subject to applicable terms and conditions. ●Customers who rejoin within six months of cancellation will automatically have their benefits restored. Those who do not rejoin within this period may apply for the restoration program on the T World website, with benefits restored if they rejoin within three years of application. Subscription Cancellation Fee Waiver ●Customers who were subscribed to SK Telecom before midnight on April 18, and either canceled their subscription after the cybersecurity incident or intended to cancel it by July 14, will have their telecommunication service cancellation fees waived. The scope and method of reimbursement will be determined in accordance with SK Telecom’s internal policies and applicable laws. For further details, please refer to the T World website. Details about the Customer Appreciation Package will be provided to all customers via MMS and can also be found on the dedicated information page.

SK Telecom (NYSE: SKM) today announced its earnings for the first quarter of 2025 based on a Korean International Financial Reporting Standards (K-IFRS) consolidated basis: revenue of KRW 4.4537 trillion, operating income of KRW 567.4 billion, and net income of KRW 361.6 billion. The company experienced solid revenue growth in its artificial intelligence (AI) businesses, such as AI data centers (AIDC) and AI transformation (AIX), as well as in its fixed line business. However, the sales of some subsidiaries in 2024 resulted in a slight revenue decrease of 0.5% compared to the same period in the previous year. Operating income increased by 13.8%, driven by the growth in AI businesses centered on AIDC and AIX. Net income experienced a slight decrease of 0.1% year over year (YoY). ■ Continued Growth in AI Business and Increased Subscriber Numbers in Telecommunications In the first quarter, SK Telecom’s AIDC business recorded revenue of KRW 102.0 billion, marking an 11.1% YoY increase, driven by increased data center capacity and utilization rates. Positioned as a high-growth business generating over KRW 100 billion per quarter, AIDC is set to accelerate its push into hyperscale AIDC in the mid to long term. The AIX business also continued its growth trajectory, generating KRW 45.2 billion in revenue, up 27.2% from the same period last year. While AI cloud revenue continues to rise, the B2B segment has also contributed to the company’s growth through expanded AI marketing contracts. SK Telecom plans to officially launch ‘A. Biz’ (A-DoT Biz), its enterprise-focused AI assistant, as early as the first half of this year following beta testing. In the AI services domain, the cumulative user base of the ‘A.’ (A-DoT) service surpassed 9 million. Meanwhile, ‘Aster’ (A*), SK Telecom’s global AI agent service, launched open beta testing in the U.S. at the end of March. The service is being continuously refined based on user feedback, with an official release scheduled for the second half of this year. The company’s telecommunications business also saw a steady rise in the number of subscribers, particularly for 5G and high-speed internet services. The dividend for the first quarter has been set at KRW 830 per share, with the record date scheduled for May 31. In March, SK Telecom revised its articles of incorporation to improve dividend predictability by determining the dividend amount in advance and then setting the record date. ■ Strengthening Customer Protection to Prioritize Trust After Cybersecurity Incident In response to the recent cybersecurity incident, SK Telecom has elevated its Fraud Detection System (FDS) — which blocks abnormal authentication attempts — to its highest operational level. The company also completed automatic enrollment in its SIM card protection service for all eligible customers. Additionally, the company began offering free SIM card replacements to interested customers, with 1.47 million having completed the process as of May 11. SK Telecom is introducing a new ‘SIM Reset’ solution on May 12, which blocks SIM cloning by modifying certain information on the existing SIM without the need to physically replace it. Also, the SIM card protection service has been upgraded to ensure the protection of customer information even while using overseas roaming. The newly introduced SIM Reset works by changing part of the user information stored on the SIM, such as user authentication and user-saved information, while keeping the user-stored data intact. Moreover, various network functions will be provided simultaneously to offer the same protective effect as replacing the SIM card. Notably, SIM Reset can retain the user’s stored information on the SIM card. Therefore, unlike replacing the SIM card, there is no need to reset financial certificates, T-money, contacts and more. It is also advantageous that there is no need for new authentication with financial institutions, enabling convenient and quick processing. SIM Reset is available for both SIM and eSIM users. To expedite the replacement process, SK Telecom has temporarily suspended all new subscriber recruitment and number porting services at over 2,600 T World stores nationwide, focusing exclusively on SIM replacement services. SK Telecom is committed to restoring customer trust by establishing a ‘Customer Trust Restoration Committee,’ which will involve external experts and customers. Additionally, the company will continue to develop security systems and measures to strengthen customer protection. “We are taking this incident to thoroughly reassess all aspects of our business and operations to enhance our fundamental competitiveness,” said Kim Yang-seob, CFO of SK Telecom. “SK Telecom will focus all of its capabilities on safeguarding our customers and maintaining the trust that our customers have placed in us over the past 40 years.” ※Attachment 1.Summary of Consolidated Income Statement(Unit: KRW billion) Type 25.1Q 24.1Q YoY 24.4Q QoQ Revenue 4,454 4,475 △0.5% 4,512 △1.3% Operating Income 567 498 13.8% 254 123.2% Net Income 362 362 △0.1% 395 △8.4% ※Attachment 2.Summary of Non-Consolidated Income Statement(Unit: KRW billion) Type 25.1Q 24.1Q YoY 24.4Q QoQ Revenue 3,167 3,189 △0.7% 3,191 △0.7% Operating Income 482 436 10.5% 179 169.0% Net Income 475 492 △3.6% 286 66.1%

SK Telecom (NYSE: SKM) today announced that it has signed a Memorandum of Understanding (MoU) with Giga Computing, a leader in liquid cooling technology, and SK Enmove to jointly develop next-generation cooling solutions. Under this MoU, the three companies will collaborate on extensive research and development (R&D) efforts, including validating technologies to optimize liquid cooling performance and developing artificial intelligence data center (AIDC) solutions. Giga Computing will contribute its expertise in liquid cooling solutions, while SK Enmove will supply high-quality cooling fluids, leveraging its technological capabilities and competitiveness in the high-quality lubricants market. The cooperation will focus on optimizing and validating all three liquid cooling methods commonly used in data centers — Direct Liquid Cooling (DLC), Immersion Liquid Cooling (ILC) and Precision Liquid Cooling (PLC). Additionally, the companies will develop a liquid cooling package solution by conducting operational verification, which houses GPU and NPU servers. Through this global partnership, SK Telecom aims to enhance its capabilities in designing and operating next-generation cooling technologies that minimize power consumption and heat generation — key factors in AIDC operations. Furthermore, the company plans to leverage its advancements in cooling technology to strengthen the AIDC competitiveness of the SK Group as a whole. “Our partnership will accelerate the development of liquid cooling solutions, a key next-generation technology for AIDCs,” said Yang Seung-hyun, Head of AI R&D Center at SK Telecom. “SK Telecom is committed to becoming a global leader in AIDC operations with unique capabilities through collaboration with global leading companies.” “As a market leader in cooling fluids, SK Enmove will leverage this collaboration to drive the growth of the liquid cooling market with optimized cooling fluids that can maximize data center energy efficiency and further solidify our position as a leader in energy efficiency,” said Kim Dae-jung, Head of the Green Business Unit at SK Enmove. “As AI and high-performance computing continue to advance, liquid cooling has become a critical technology for building sustainable data centers,” said Daniel Hou, General Manager of Giga Computing. “Through our collaboration with SK Telecom and SK Enmove, Giga Computing will leverage its expertise in liquid cooling solutions to drive energy efficiency and innovation in data center infrastructure. We look forward to jointly developing next-generation cooling technologies that enable more efficient and environmentally sustainable AIDC operations.”

SK Telecom (NYSE: SKM) today announced a strategic partnership with Schneider Electric, a global leader in energy management and automation, at the Mobile World Congress 2025(MWC25). The partners will collaborate on mechanical, electrical and plumbing (MEP) systems for artificial intelligence data centers (AIDCs). Schneider Electric is a leading company in power and distribution technology for AI data centers, offering comprehensive integrated infrastructure solutions that cover every stage from design and construction to operation. AIDC MEP systems play a critical role in ensuring the stability and efficiency of AIDCs from initial construction to full operational capability. Through this partnership, the two companies will first cooperate on the construction and development of hyperscale AIDCs in key regions in Korea. Their collaboration will span the entire MEP sector, including component and product solutions as well as consulting, and will serve as a foundation for expanding AIDC projects into global markets. By combining SK Telecom’s AIDC expertise with Schneider Electric’s capabilities in MEP systems, power, cooling and integrated data center management, the companies expect to generate significant synergies. “Our partnership with Schneider Electric, one of the world’s leading AIDC solution providers, will not only strengthen SK Telecom’s competitiveness in AIDCs but also accelerate our global expansion,” said Ryu Young-sang, CEO of SK Telecom. “Through this collaboration, we expect to create powerful synergies by combining SK Telecom’s expertise in AIDC operations with our advance capabilities, ultimately delivering enhanced efficiency and performance in AIDC infrastructure,” said Pankaj Sharma, Executive Vice President of Schneider Electric.