KRSIM

KRSIM is SK Telecom's official international partner, offering the carrier's full 5G and LTE network to travelers. You get a Korean 010 phone number as part of the plan, which is useful for local services and Korean apps that verify via SMS. This official status gives you direct access to Korea's largest carrier network.

Pick KRSIM if you need legitimate carrier status and a real local number. The 010 prefix carries weight in Korea, and you'll find better compatibility with Korean banking and video-calling apps than with some reseller eSIMs.