The South Korean telco attributed the growth to increases in 5G subscribers and two new data centres being built.
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South Korea's IT ministry is still investigating what caused KT's nationwide outage of their network.
Remote services grew, but subsidiaries in traditional industries contract in light of the COVID-19 pandemic.
Workers at telcos' call centres at the city of Daegu, the epicentre of COVID-19 in South Korea, will work from home.
The expanded coverage will deploy Narrowband Internet of Things (NB-IoT) through its networks.
SK Telecom, South Korea's largest wireless operator, has announced that Samsung, Ericsson and Nokia will be the preferred bidders for 5G equipment with Huawei noticeably absent.
The government expects fifth-generation (5G) network to be commercialized in March 2019 and deployed nationwide by 2022.
The South Korean tech giant will supply its compatriot telco with NB-IoT solutions.
South Korean telco KT will cooperate with the UN to build a big data-based contagion prevention system under a memorandum of understanding (MOU).
Speaking at the United Nations Global Compact, KT Chairman Hwang Chang-gyu said global telcos must take new roles to prevent contagions by sharing their big data during a state of emergency.