Here are the main telecom operators in South Korea:

✓ SK Telecom: Established in 1984, SK Telecom is the largest telecom operator in South Korea and has over 26 million subscribers. It has the best mobile coverage and speed in the country, with the highest 4G LTE download speeds of up to 75 Mbps. According to Opensignal, it has the highest 4G availability and the fastest 4G download speed. It also offers various internet and mobile plans, including prepaid plans, postpaid plans, and family plans.

✓ KT Corporation: Founded in 1981, KT Corporation is the second-largest telecom operator in South Korea. It has a subscriber base of over 20 million and offers 4G LTE download speeds of up to 100 Mbps. According to Opensignal, it has the highest 4G download speed and the highest 4G latency. It also offers various services, such as broadband internet, fixed-line phone services, and mobile services.

✓ LG U+: LG U+ is the third-largest telecom operator in South Korea, established in 1995. It has a subscriber base of over 12 million and offers 4G LTE download speeds of up to 60 Mbps. According to Opensignal, it has the highest 3G download speed, but is behind SK Telecom and KT Corporation in terms of 4G availability and download speeds. It also offers a variety of services, such as broadband internet, fixed-line phone services, television services, and mobile services.