Yes, for seamless integration and operation of a CoreESIM profile in Seoul, your smartphone must be unlocked by your originating carrier. An unlocked device permits the installation and activation of third-party eSIM profiles, allowing it to register with local Korean mobile networks. Before purchasing your CoreESIM plan, it is imperative to confirm your device's unlocked status and eSIM compatibility to prevent activation issues and ensure full functionality in South Korea.
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Is an unlocked device a prerequisite for using CoreESIM in Seoul?
Updated May 30, 2026
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