Best eSIM for Japan from Australia: the real comparison

Prices in USD, correct at time of writing, check simlocal page for current pricing. All plans are data-only, with hotspot tethering included.

After a 9-10 hour flight, the last thing you want is to be hunting for a SIM kiosk at Narita or Haneda with jet lag setting in. An eSIM installs on Wi-Fi before you leave home and switches on the moment you land, no queue, and your Australian SIM stays in your phone the whole time for calls and texts on your normal number.

Telstra's International Day Pass for Japan (Zone 2) costs $10 AUD a day for just 2GB of data, for a 10-day trip, that's $100 for up to 20GB, and you also need to manually activate the pass in the My Telstra app before you fly, since it doesn't switch on by itself. Optus and Vodafone run similar day-rate models. A physical Japan SIM from an airport kiosk is usually cheaper than roaming but costs you time and a counter queue right when you're most jet-lagged. An eSIM avoids both: no daily roaming fee, no kiosk, and a plan sized for your actual trip length.

• Coverage and network quality: which of Japan's networks does the eSIM actually run on, and how does that network perform outside the biggest cities?
• Data plans and pricing: fixed data works out cheaper if you know roughly how much you'll use; unlimited removes the guesswork on longer or heavier-use trips.
• Customer support: real human support matters if activation doesn't go smoothly the moment you land, not just a help-centre article you have to search through.
• Ease of activation: look for instant QR-code setup you can complete before you fly, rather than anything requiring delivery or an in-person pickup.

Both are among Japan's three major carriers. AU/KDDI is the second-largest network nationally, with strong coverage in cities, towns and along the rail network, the routes most Australian visitors actually travel. NTT Docomo, Japan's largest network, has a slight edge specifically in remote rural and mountainous areas. Unless your trip is heavily off the beaten track, AU/KDDI holds up well.

For a full breakdown of coverage and city speed tests, see our AU/KDDI network deep-dive.

If you're mainly using maps, messaging and social media with hotel Wi-Fi in the evenings, 10-20GB comfortably covers a two-to-three week trip. If you're streaming, working remotely, or navigating constantly without relying on Wi-Fi, one of the unlimited plans removes the guesswork entirely.

• Check your phone supports eSIM and is unlocked from your Australian carrier.
• Buy your plan on simlocal.com, you'll get a QR code by email.
• Install it at home, on Wi-Fi, a day or two before you fly.
• Set the new eSIM as your data line, and keep your Australian SIM active for calls and texts.
• Turn off data roaming on your home SIM so you're not charged the moment you land.

• Download offline Google Maps for the cities you're visiting before you fly, useful backup if you end up somewhere coverage is patchy.
• Turn on your phone's data-saving mode if you've bought a fixed-data plan rather than unlimited, to stretch it further across a longer trip.
• If you're travelling between islands or into more rural areas (Hokkaido's countryside, parts of the Japanese Alps), expect coverage to thin out on any network, download what you need in advance.
• Keep your Sim Local eSIM as a second line rather than removing your Australian SIM, that way you're still reachable on your normal number for anything time-sensitive back home.

• Double-check the new eSIM (not your Australian SIM) is set as the active data line in your phone's settings.
• Make sure data roaming is switched on for the eSIM specifically, this is separate from your Australian SIM's roaming setting.
• Restart your phone, this resolves the majority of connection issues after landing.
• If it's still not connecting, reach Sim Local's support team via live chat or WhatsApp rather than waiting until you're back on Wi-Fi.

Sim Local is the strongest all-round option, unlimited AU/KDDI plans with a genuine 10GB of high-speed data a day, plus fixed-data NTT Docomo plans from $4.00 if you don't need unlimited. Airalo is cheaper to start but throttles after just 3GB a day; Holafly only offers unlimited plans at a premium price.

Buy your plan on simlocal.com, install it via the QR code you receive by email while you're still on Wi-Fi at home, then set it as your data line and switch off roaming on your Australian SIM before you land.

Yes, as long as your phone supports eSIM and isn't locked to your Australian carrier. Most iPhones from XS onward and recent Android flagships support eSIM, check your phone's settings or use an eSIM compatibility checker before you buy.

Sim Local's Japan eSIMs are data-only, so you won't get a Japanese phone number for calls or texts, WhatsApp, FaceTime and similar apps handle calls over data instead. Coverage can also thin out in very remote rural or mountainous areas, same as it would for a local SIM on the same network.

An eSIM is almost always cheaper than Telstra, Optus or Vodafone roaming, which typically charges a daily fee for a small data allowance (Telstra's Zone 2 pass is $10 AUD a day for 2GB). A physical local SIM can be similarly priced to an eSIM, but costs you a counter queue on arrival that an eSIM avoids entirely.

Sim Local's Japan eSIMs are data-only, without a Japanese phone number attached. For calls and messaging, WhatsApp, FaceTime or similar apps work over the eSIM's data connection, and your Australian number stays active on your physical SIM the whole time for anything that specifically needs it.