[스마트 인포그래픽] 03. 국내 통신 3사 LTE 전국 84개시 구축속도 비교 kt olleh mobile Infographics. kt 4G LTE WARP service in Korea. The Fourth generation; a system for mobile phones allowing fast connection, internet access, digital photography, graphics transmission and display, and other advanced features. You can use LTE WARP in the 84 cities all over the country in Korea.