Letisim guides
Practical, source-checked guides to eSIM, mobile data and staying connected abroad.
Updated
Start with your own mobile data usage, allow for extra video and tethering, and check your plan's validity. Our daily allowance table helps you compare sizes without promising that one size suits everyone.
Read guideBuild one connected day around three route roles, then shorten it at Tokyo Station or stop before Asakusa without breaking the way back.
Read guideSecure one verified bag handoff with a backup, then use a compact Tokyo Station-to-Ginza route that can stop early without breaking check-in.
Read guideSave the next booking, terminal, transfer and recovery details before leaving each island; verify the next island separately after arrival.
Read guideCheck whether your home plan qualifies on land, switch mobile data off at sea when uncertain, and save an arrival pack offline.
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Read the live order first, install only when its instructions allow, save the recovery path, then switch the data line on at the instructed moment.
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Pick one primary route before departure, decide whether a local number matters, and save an offline arrival fallback.
Read guidePick one primary route before departure, decide whether a local number matters, and save an offline arrival fallback.
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A phone is ready for a travel eSIM only when its exact variant supports eSIM, the feature is available in settings and another carrier is allowed.
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No data after landing does not prove the eSIM is faulty: verify the plan and destination, then check routing, roaming and network registration in order.
Read guideGive each line one job: the travel eSIM carries data, while the home line stays available only for the calls or messages you actually need.
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