An eSIM installs digitally from a QR code sent after purchase, and most Japan travel eSIMs can be set up entirely before departure.
Before you fly
Purchase and install the eSIM profile a day or two before departure; most providers recommend not activating the plan itself until you land.
On landing in Osaka
Activation typically happens automatically once your phone connects at Kansai Airport, so there is no counter to visit at all if everything is set up correctly.
Tip: If your eSIM does not connect right away, toggling airplane mode off and on, or manually selecting a network in your phone settings, resolves most issues.
Checking compatibility first
Most phones from the past several years support eSIM, but it is worth checking your specific model before purchasing, since older or budget devices may not.
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