eSIM Japan Not Working at Narita/Haneda? 8 Fixes 2026

You've just landed at Narita or Haneda, you pull out your phone… and your Japan eSIM shows no signal. Don't panic: in almost every case, it's not a faulty eSIM but a setting you can fix in two minutes. This guide gathers the 8 fixes that actually work, in the order to try them, with the exact steps on iPhone and Android so you're back online before you even catch the train into Tokyo.

Why your eSIM gets no signal on arrival at Narita or Haneda

A PlanJapan eSIM is data only: it relies on NTT Docomo's or SoftBank's network to give you internet, with no Japanese number and no calls over the network. When nothing shows up on landing, the cause is almost always one of these: data roaming was left off, the phone is still using your home line for data, the eSIM wasn't activated correctly, or the airport terminal has weak signal in its basement levels.

The good news is that these causes are all fixed from your phone's settings, with no technical support and no Wi-Fi connection needed. Before assuming a defect, remember that both Narita and Haneda are fully covered by NTT Docomo and SoftBank: the network is there, it's your device's configuration that needs aligning. Work through the fixes below in order, from most common to rarest.

One confusing piece of vocabulary: on a travel eSIM, "data roaming" must be turned on even though you pay no roaming fees. This setting simply lets your eSIM connect to the Japanese partner network. Leaving it off is by far the number-one reported cause of failure on arrival. That's also why it helps to have read our guide on activating your eSIM at Narita and Haneda airport before you fly.

The 3 first things to try (90% of cases)

Before any advanced setting, run these three checks in order. They resolve the vast majority of "eSIM not working" cases at Narita and Haneda. It takes two minutes, clock in hand.

In most cases, the signal appears at the first or second step, with "NTT DOCOMO" or "SoftBank" shown at the top of the screen. If after the restart you see the carrier name but still no data, move on to manual network selection and the APN check. Our guide on a Japan eSIM with no signal walks through every screen.

Select the right network and check the APN

If the phone won't attach to any network automatically, force manual selection. On iPhone: Settings → Cellular → PlanJapan line → Network Selection → turn off "Automatic" → choose NTT DOCOMO or SoftBank depending on your plan. On Android: Settings → Mobile networks → Network operators → manual search, then select the partner carrier. The connection usually establishes in a few seconds.

If you have signal but no data flows, check the APN (the access point that opens the data connection). Most eSIMs configure it automatically, but a manual entry may be needed on some Android phones. The APN to enter is in your PlanJapan eSIM delivery email; copy it exactly, with no stray spaces, then restart. Don't touch the other fields.

Also disable any active VPN for the first connection: a VPN that starts before data is established can block the network attachment. You can re-enable it once connected. For VPN use in Japan, see our eSIM and connectivity in Japan comparison, which covers these settings.

Check the eSIM is installed and activated

An eSIM can be installed but not activated, or installed then disabled by accident. Open Settings → Cellular: the PlanJapan line should appear and be turned on (green switch on iPhone). If it's greyed out or missing, it wasn't added correctly. Reinstalling from the QR code is still possible as long as you haven't deleted it from the phone.

Also check your plan's activation window. Classic data eSIMs (10, 20 or 50 GB) can be activated freely for 180 days after purchase and stay valid for 30 days once started. Unlimited plans must be activated within 30 days of purchase. If you bought well in advance, make sure the plan is within its usage window. Our guide on when to activate your Japan eSIM sums up these rules.

Finally, check your personal number isn't interfering. On dual SIM, keep your home line active for calls and texts, but turn off its data roaming so it doesn't grab priority. The recommended setup is detailed in our dual SIM eSIM Japan guide: one line for voice, the eSIM for data.

Weak signal in the terminal: wait and move

The arrival halls at Narita (terminals 1, 2 and 3) and Haneda (terminals 2 and 3 for international) include large basement areas, near the baggage belts and immigration, where mobile signal is naturally weakened. It's not unusual for the eSIM to show just one or two bars during passport control, then jump to 4G/5G as soon as you head up to the main hall or the station.

"Nine eSIM 'failures' out of ten at the airport aren't failures: it's a setting, or two bars of signal in the basement."

So give the phone two to three minutes after the restart, especially if you're still near immigration. Move toward a window or head for the JR station or the Keisei Skyliner: the connection almost always stabilises. If, once outside or on the train, you still have nothing, the issue is no longer signal but configuration — go back to fixes 1 to 4.

Phone not compatible or locked: what to do

If you've tried everything and the eSIM stays silent, the issue may be the device. Two conditions are essential: the phone must be eSIM-compatible and carrier-unlocked. An iPhone XS or newer, a Galaxy S20 or newer, a Pixel 4 or newer are compatible; some models sold in Japan or by locked carriers may refuse a foreign eSIM.

To check compatibility, open the phone app and dial *#06#: if an "EID" number appears, your device supports eSIM. For unlocking, contact your home carrier before departure — it's free and often immediate. Our article on a phone not compatible with eSIM lists the models and alternatives.

If your device is genuinely incompatible, don't try an off-catalogue workaround: PlanJapan offers data eSIMs for Japan, not physical cards or equipment rental. The best option is to borrow or use a compatible device, or to share the connection from a travel companion's phone running a PlanJapan eSIM. As a last resort, the general Japan eSIM not working guide covers the rarer cases.

FAQ — eSIM not working at Narita and Haneda

Do I need to turn on data roaming with an eSIM?

Yes. On a travel eSIM, data roaming must be on to allow the connection to the Japanese partner network, without generating any roaming fees. It's the first thing to check if nothing shows up on arrival.

My eSIM says "No Service" at the airport — is it faulty?

Almost never. In 9 cases out of 10 it's a setting: roaming off, wrong data line, or weak signal in the basement near immigration. Turn on roaming, select the eSIM for data, restart, then move toward the main hall.

Should I activate my eSIM before or after arriving in Japan?

Install the eSIM (the QR code) before departure, on Wi-Fi, then activate it on arrival in Japan. For a classic data plan you have 180 days to activate; for an unlimited plan, 30 days. Activating on the ground ensures the validity period starts during your trip.

What if I have signal but no data?

Check the eSIM is the selected data line, verify the APN listed in your delivery email, and disable any VPN for the first connection. A restart after these settings usually restores data.

Can I keep my number while using the eSIM?

Yes, thanks to dual SIM. Keep your home line active for calls and texts, turn off its data roaming, and let the PlanJapan eSIM handle internet. WhatsApp, iMessage and Signal work through your usual number.

Is my phone eSIM-compatible?

Dial *#06# in the phone app: if an "EID" identifier appears, the device supports eSIM. It must also be carrier-unlocked. iPhone XS and newer, Galaxy S20 and newer, Pixel 4 and newer are compatible.

Related articles

• Japan eSIM: every problem and its fix
• Activating your eSIM at Narita and Haneda airport
• How to get internet in Japan: every option