3G UMTS Frequency Bands
Cheo Technology, trading as Koryolink, is the largest mobile carrier operating in North Korea (Democratic Peoples Republic of Korea). The company was founded in 2008 as a joint venture between Egyptian firm Orascom Telecom Media and Technology (OTMT) and the North Korean government. The DPRK government granted Koryolink exclusive rights to provide cellular services in the country, however this condition expired in 2012 and competitor Byol (wholly owned by the DPRK government) was launched.
Despite holding a 75% ownership Orascom declared that it had effectively lost control of the company in 2015 following the government refusing Orascom from repatriating funds back to the parent entity, claiming all profits must be reinvested in North Korea.
Koryolink provides 3G UMTS services over B1 (2100 MHz), and there appears no intention to further development of the network.
In December 2017 Orascom reportedly pulled operations in the DPRK, with all subscribers transferred to state-owned rival Byol.