Yes, your device must be fully unlocked by your originating carrier to enable the use of any international eSIM, including CoreESIM services for Kyoto. An unlocked device permits connection to local Japanese mobile networks such as NTT Docomo, au, or SoftBank. Attempting to install an eSIM on a carrier-locked device will result in activation failure. CoreESIM strongly advises verifying your smartphone's unlock status with your home carrier prior to purchasing an eSIM to prevent connectivity issues upon arrival in Japan.
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Is an unlocked device a prerequisite for utilizing a CoreESIM in <strong>Kyoto</strong>?
Updated May 30, 2026
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