Overview
SK Telecom Co., Ltd. is a South Korean telecommunications and technology company. Its core business is mobile voice and data service, complemented by fixed-line communications, broadband, IPTV and cable TV; it also provides services including IoT, enterprise communications, cloud, AI and subscriptions. South Korea is its primary market, with international reach through roaming agreements with foreign operators.[1][2][3][4][5][6][7]
For the year ended December 31, 2025, SK Telecom reported consolidated revenue of KRW 17.099 trillion; cellular services accounted for KRW 12.553 trillion.[8][9] Its 2025 Sustainability Report lists 5,316 employees.[10] The company traces its mobile communications operations to 1984.[11] Its stated vision focuses on connecting AI technology with values important to customers and bringing new energy to Korea.[12] [1][2][3][4][5][6][7][8][9][10][11][12]
Products & services
SK Telecom’s consumer offerings include wireless voice and data services, 5G/LTE plans, devices and T Membership, which provides subscriber discounts, points, shopping and promotional benefits. Its 5GX plans include unlimited domestic voice, text and data options; the company also offers lower-priced plans with smaller data allowances and online-only “Direct” plans. SK Telecom describes its nationwide 5G network as supporting maximum transmission speeds of 2.75 Gbps and mMTC connections for IoT devices.[13][14][15][16]
Its business AI portfolio includes generative AI, AI vision, AI contact-center, AI marketing, AI data and physical-AI offerings. A. Biz is an enterprise AI agent designed to assist with administrative work and functions such as legal, tax, public relations, purchasing and personnel management. GPU-as-a-Service gives enterprise customers on-demand access to GPU cloud resources; SK Telecom launched the service in 2025 and later introduced its Haein cluster, equipped with more than 1,000 NVIDIA B200 GPUs.[6][17]
In media, SK Telecom offers AI B tv, which uses viewer identification and viewing history to personalize VOD recommendations, and B tv A. Service, which uses its A. language model for voice commands, content discovery and recommendations. SK Broadband’s services include broadband internet, IPTV and cable television, alongside fixed-line and international calling and interconnection services.[18][19][7] [13][14][15][16][6][17][18][19][7]
Geographic presence
SK Telecom’s operating footprint is centered in South Korea. At year-end 2025, its mobile network reached substantially all of the country’s population, and it reported 23.5 million mobile subscribers, including MVNO subscribers, equivalent to a 41.6% market share. The company also reported nationwide 5G coverage.[1][14]
Its registered office and corporate headquarters are at SK T-Tower, 65 Eulji-ro, Jung-gu, Seoul. Listed regional facilities span the Seoul Metropolitan Area, Gyeongsang Provinces, Jeolla and Jeju Provinces, and Chungcheong Province.[20][21]
The 2025 annual report does not give geographic revenue percentages or a country-by-country employee distribution. Its listed overseas subsidiaries and entities include operations or holdings in the United States, China, and the Cayman Islands, while the subsidiaries are predominantly based in Korea.[22][23] [1][14][20][21][22][23]
Business segments
SK Telecom reports three financial segments. Based on 2025 external revenue after intersegment eliminations, Cellular services accounted for approximately 73.4% (₩12,552.5 billion) of consolidated revenue. The segment covers wireless voice and data services, wireless-device sales, and related technology solutions and services.[24][1][25][26]
Fixed-line telecommunication services contributed approximately 24.5% (₩4,191.1 billion) of 2025 external revenue. Its activities include broadband Internet, IPTV and cable TV, fixed-line telephone, international calling, and related interconnection and services.[27][26]
The Others segment contributed approximately 2.1% (₩355.6 billion). The report describes SK Stoa’s T-commerce business as a principal remaining revenue source; it also notes that disposals of SK M&Service and NATE Communications reduced other revenue.[28][29][26] [24][1][25][26][27][28][29]
Company history
SK Telecom was founded on March 29, 1984, as Korea Mobile Telecommunications Services Co., Ltd., and began car-phone service that year. After the company was renamed Korea Mobile Telecommunications, SK Group acquired management control in 1994; it adopted the SK Telecom name in 1997. In 1996, it launched commercial CDMA digital mobile service, described by the company as the world’s first CDMA-based cellular service.[30][11]
The company expanded through the 1999 acquisition and 2002 merger with Shinsegi Telecom, and launched CDMA2000 1x EV-DO service in 2002. It entered fixed broadband by acquiring Hanaro Telecom in 2008, later renamed SK Broadband. SK Telecom launched LTE in 2011 and LTE-Advanced in 2013, followed by an initial 5G network in 2018 and commercial 5G service in 2019.[31][32][33][34][35][36][37]
On November 1, 2021, SK Telecom completed a corporate split, transferring a portfolio of non-telecom investment businesses to the newly established SK Square.[38] [38][30][11][31][32][33][34][35][36][37]
Sources
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