SK expanded into the landline market by acquiring second-rated fixed-line operator Hanaro Telecom in February 2008.

[5] The company's online brands include Nate, a web portal, June, a mobile multimedia service, Moneta, an e-banking mobile app, Nate Drive, a telematics service, and Digital Home, an online interface to remote-control household appliances.

[9][10] SK Telecom was established in March 1984 under the name Korea Mobile Telecommunications Services Corp. (KMTSC; Korean: 한국 이동 통신 서비스), but was renamed Korea Mobile Telecommunications Corp. (KMTC; Korean: 한국 이동 통신) in May 1988.

[citation needed] In October 2000, SK Telecom became the second operator in the world after NTT DoCoMo to launch a commercial 3G service using W-CDMA technology.

In 2006, the well-known "SKY" brand of mobile devices became fully owned by Pantech as it finalized its takeover of SK Teletech.

[citation needed] Founded on March 29, 1984, as Korea Mobile Telecommunications Services Corp., the state-owned carrier introduced pagers and car phones to the Korean market.

[citation needed] In April 1993, the South Korean government, through KMTC, adopted CDMA as the national cellular telephone system.

[citation needed] SK Group completed its takeover of KMTC in January 1997, as it became the world's sixth carrier to attain ten million subscriptions.

In April 1999, SK Telecom entered the Mongolian market by co-founding Skytel LLC with nearly 30 percent ownership stake.TTL, a wireless plan targeting younger users, and nTOP, a cellular internet service were launched in July and October 1999, respectively.In December 1999, SK Telecom surpassed ten million subscriber mark, the following month, it launched the world's first commercial CDMA2000 service.

[15] In the same month also, the company deployed world's first commercial synchronous IMT-2000 facility.In March 2002, the carrier struck international roaming deals between countries using CDMA and GSM networks.

[citation needed] In February 2004, SK won a contract for a joint venture with China Unicom, called UNISK.

In April 2007, a project to create TD-SCDMA, China's 3G wireless broadband equivalent was signed with the Chinese government.

[26] In 2022, SK Telecom announced a partnership with Joby Aviation with the goal to create a line of flying taxis for the South Korean market by 2025.

[citation needed] In August 2006, SK Telecom signed an MoU making it the first non-Chinese company to participate in the TD-SCDMA Project.

These models would be refined and updated for use by tech-savvy American consumers, allowing for the first time handsets with functionalities previously unavailable in the U.S.

[33] In September 2001, SK Telecom established S-Telecom, through a Business Cooperation Contract (BCC) with SPT (Saigon Postel), a Vietnamese phone company with a CDMA license.

[citation needed] S-Telecom, Vietnam's first CDMA wireless carrier, launched commercial services in July 2003 and has since upgraded its network to CDMA2000 1xEV-DO to meet growing demand.

In 2006, SK Communications expanded into new markets with an enhanced version of Korea's leading social networking site Cyworld.

TU Media, the nationwide satellite Digital Multimedia Broadcasting (DMB) service, is also making fast growth, attracting over one million subscribers in 2006.

With Thrunet and Hanaro controlling nearly half of the growing high-speed Internet market, SK Telecom entered the market in late 1999 with Dream NetsGo, a cable Internet provider that offered its services in a partnership with local cable TV operator Dreamcity Media.

The company's Internet Protocol (IP)-based central exchange system provides Centrex functions (internal calls, customer service numbers, etc.)

[37] Founded in 1999 as Lycos Korea,[38] SK Communications is the technology company responsible for some of the most successful internet tools and products in the Korean market.

To make full use of its premium base, the tech firm is building a portfolio of content providers, including education company Etoos; consumer shopping services under the Cymarket brand, which leverage Cyworld's network and traffic; gaming subsidiary SK i-media; and Egloos, the leading independent blogging service in Korea.

In addition, the company acquired a significant stake (24.4%) in a powerful online search engine, Empas, for KRW 37.2 billion.

Building on the commercial long-distance telephony and value-added services launched in 2005, the carrier began offering Korean text messaging in June 2006 in the U.S.

Its nationwide DMB is available on 37 channels, consisting of 16 video, 20 audio and one data, and provides programs on education, games, drama, music, news and culture.

In addition to South Korea's 84 cities, TU Media provides service in express highways and Seoul metropolitan subways.

[citation needed] In 2010 TU Media was merged with another subsidiary, SK Telink, Korea's leading international call service provider.

[citation needed] Established in November 2021 through a spin-off, SK Square aim to work in the semiconductor industry as well as invest in media, security services and online shopping companies.

[52] Due to KT Wiz being a relatively new franchise and having a poor record for much of its early years, the "rivalry" was largely one-sided and given less attention compared to esports and basketball, where such match-ups are generally hotly contested affairs.