KT Korea Telecom logo

Company Name

KT Corporation

Ownership Type

Publicly Traded Company



3G UMTS Frequency Bands

4G LTE Frequency Bands

5G NR Frequency Bands

Company Overview

KT Corporation (케이티 주식회사) is the Republic of Korea's largest telecommunications services provider. Formerly known as Korea Telecom, the state-owned incumbent telecommunications provider, the company was founded in September 1885. KT's modern structure was formed in 1981 as a public utility. Following a series of sell-offs and mergers throughout the 90s, privatisation began May 2001 and by 2002 Korea Telecom, now KT, was formally a publicly traded company. The company is listed on the KRX (030200), NYSE (KT), and LSX (KTCD) exchanges.

The company began its 2G GSM services in 1996 over the 1800 MHz band, and launched 3G UMTS over B1 (2100 MHz) in June 2006. 3G services were upgraded to HSPA+ in January 2012.

4G LTE was first launched under the Olleh LTE (올레 엘티이) banner in January 2012 following the refarming and deactivation of 1800 MHz 2G GSM services. VoLTE was implemented later in October 2012 to improve voice capacity. By September 2013 LTE bandwidth was extended to 20 MHz, permitting data rates up to 150 Mbps following the company securing additional spectrum in an August 2013 auction. Shortly after, KT introduced a B8 (900 MHz) carrier, implementing LTE-A 2C aggregation (CA_3A-8A) to provide higher peak data rates.

LTE-A was extended further in January 2015 with the addition of 10 MHz B1 (2100 MHz), providing 3C aggregation (300 Mbps peak data rates). In June 2015 announced its intention to deploy a "GIGA-LTE" network, comprising 3C aggregation and LTE-U LAA to provide peak data rates of 1.17 Gbps.


The company was an early adopter of the NB-IoT standard, demonstrating the technology in September 2016. The network was activated in April 2017, with national coverage achieved by July that year. The network, shared with LG U+, is understood to be using KT's B3 (1800 MHz) carrier. KT also provides an LTE-M network over its B3 (1800 MHz) network.


KT became an early leader in the development of 5G NR, announcing its development in March 2015 and releasing draft specifications of the technology in mid-2016. By October 2016 the company had made its first data call over 5G. February 2017 saw a full end-to-end service completed, and October 2017 network handoff had been implemented.

KT showed the world’s first successful “5G network demo-service” at the PyeongChand 2018 Winter Olympic Games. The network implemented 252 sites outfitted with TDD n257 (28 GHz), Massive MIMO, hybrid-beamforming, and using intra-band 8CA of 100 MHz carriers (n257M).

South Korea held a 5G spectrum auction in March 2018, offering 300 MHz in the 3.5 GHz band, and 1 GHz in the 28 GHz mmWave band. KT secured 3500 to 3600 MHz, and the 26.5 to 27.3 GHz blocks.

Live network testing has been conducted in partnership with Samsung, most notably in March 2019 when KT achieved 1 Gbps over its n78 (3500 MHz) 5G network with a Samsung Galaxy S10. KT launched its 5G mobile network alongside competitors in April 2019, using a 100 MHz carrier in the n78 (3500 MHz) band.

3G UMTS Network Information

Details on UMTS network deployments are shown below. Data are often incomplete due to commercial nature. Consult dossier text for further details.

Launch Date 2006-06 Status Active
UMTS BandPacket DataStatus
4G LTE Network Information

Details on LTE network deployments are shown below. Data are often incomplete due to commercial nature. Consult dossier text for further details.

Evolution Status Active [Launched 2012-01]
Max. MIMO Max. Modulation
Carrier Aggregation Features
LTE BandChannel WidthStatus
10 MHz Active
20 MHz Active
10 MHz Active
5G NR Network Information

Details on 5G NR network deployments are shown below. Data are often incomplete due to commercial nature. Consult dossier text for further details.

Type Status Active [Launched 2019-04-03]
Max. MIMO Max. Modulation
Carrier Aggregation - Features -
NR BandChannel WidthStatus
100 MHz Active
400 MHz Trialling
IoT Network - NB-IoT (LTE Cat-NB1)
Technology Status Active
Band Launch Date
IoT Network - eMTC (LTE Cat-M1)
Technology Status Active
Band Launch Date

Stock Information


Reuters Symbol


Six Month Historic

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