Connectivity

What to do when you cannot connect to the internet in Japan

No internet in Japan? Diagnose Wi-Fi login, roaming, eSIM, APN or weak-signal problems, reconnect safely and keep an offline route and emergency backup.

Last updated: September 3, 2026

10-second answer

What to do right now

Use trusted Wi-Fi first, identify whether Wi-Fi, the selected data line, roaming, APN or local signal is failing, then change one setting at a time before buying another plan.

1Get a trusted connection and save the error
2Check the selected data line and provider settings
3Restart once, then contact the provider

Show the Japanese phrase Open official help

Detailed steps

Follow these steps

Get a trusted connection and save the error

Traveler finding an official free Wi-Fi sign

Use your hotel, airport or another clearly identified network. Save screenshots and the provider’s setup instructions before changing settings.

Check the selected data line and provider settings

Airplane mode and mobile data settings on a smartphone

Confirm that the intended SIM or eSIM is on, selected for mobile data and using the provider’s required roaming and APN settings.

Restart once, then contact the provider

eSIM for one phone and pocket Wi-Fi for several devices

Toggle airplane mode briefly, restart once and test. Do not delete an eSIM unless support confirms that its installation code can be reused.

Traveler asking hotel staff whether free Wi-Fi is available

Useful Japanese phrase

Is free Wi-Fi available here?

無料Wi-Fiはありますか？

Muryō Wi-Fi wa arimasu ka?

Diagnose before you buy another connection

First decide whether the failure is the Wi-Fi login, the phone setting, the travel SIM or eSIM, or local coverage. Changing several settings at once makes the real problem harder to find.

Match the symptom

What exactly is not working?

Wi-Fi shows “connected” but pages do not load

Forget and rejoin the intended network, then follow the phone’s sign-in notification. If no login page appears, ask the hotel, airport or facility for its current network name and login address instead of accepting an unfamiliar portal.

Your travel eSIM has signal but no data

Confirm that the purchased line is switched on, selected for mobile data and using the provider’s required data-roaming and APN settings. Do not delete the eSIM unless its provider tells you to—some installation codes cannot be reused.

Your home SIM has no roaming data

Check the carrier’s official app or support page for an overseas-data plan, roaming permission, spending block and supported Japanese network. Roaming can create charges, so do not enable it without checking the price.

No service or only one location fails

Move outside a basement, tunnel or thick-walled building, then try automatic network selection once. A local outage or weak indoor coverage will not be fixed by buying the same type of connection again.

Change one thing at a time

Safe troubleshooting order

1
Save the evidence
Take screenshots of the signal, selected data line, APN and exact error while trusted Wi-Fi is available. Keep the order email and provider support link open.
2
Check the selected line
On dual-SIM phones, confirm which line supplies mobile data. Turn off automatic data switching temporarily if it keeps returning to the wrong line.
3
Use the provider’s settings
Compare every setting with the instructions for your exact plan and phone. Menu names differ between iPhone, Android brands and software versions.
4
Restart once
Toggle airplane mode briefly, restart the phone and test one ordinary webpage. Repeated resets or deleting the line can make support harder.
5
Escalate without exposing secrets
Contact the carrier or travel-data provider over trusted Wi-Fi. Share the order number and screenshots, but never send a password, card PIN or one-time security code.

Wi-Fi says connected

Make the sign-in page appear safely

Confirm the exact network name

Match the SSID with a sign, room card or staff instruction. A similar-looking network can belong to another floor, venue or an unsafe hotspot.

Stop the phone hiding the failure

Temporarily turn off mobile data while testing the Wi-Fi. Otherwise the phone may silently use your home or travel SIM and make a broken hotspot look successful.

Pause filters only for the login

A VPN, iCloud Private Relay, custom DNS or security filter can prevent a captive portal from appearing. Pause only the relevant feature, complete the facility’s sign-in, then restore your protection.

Do not enter secrets into an unfamiliar portal

Ask staff for the current login address when the page still does not open. Do not type a card number, email password or one-time code into an unverified page.

NO-INTERNET FAQ

Fix the common dead ends

Why does Wi-Fi show connected when nothing loads?

The radio connection can succeed before the hotspot accepts you. Confirm the network name, complete its sign-in page and test one ordinary webpage. If every device fails, ask the facility whether the hotspot is down.

Should I reset all network settings?

Not first. A full reset can remove saved Wi-Fi networks, VPN or APN settings and still not solve a provider outage. Save screenshots, check the selected line and provider instructions, then use a reset only when the device or provider support specifically recommends it.

Should I delete and reinstall the eSIM?

No, not without confirmation. Some activation codes cannot be reused. Keep the eSIM installed, connect to trusted Wi-Fi and contact the provider with screenshots and the order number.

Can a data-only eSIM call 110 or 119?

Do not assume it can. Internet calling is not the same as ordinary mobile voice service. Try a working voice-capable phone or ask hotel, station, shop or nearby staff to place the emergency call.

Need directions while still offline?

Ask hotel or station staff to write the destination in Japanese, photograph the route map, and keep your accommodation address visible. For an emergency, try 119 for ambulance or fire and 110 for urgent police help. If your phone cannot place the call, ask nearby staff or another person to call.

JNTO, Apple and Google support information checked September 19, 2026. Phone menus, roaming charges, captive portals, network selection and eSIM reinstallation rules vary by device, software and provider; the instructions for the exact service you purchased take priority.

Useful links

Choose how to get online

Try the free options first. If you need a paid connection, continue to the complete SIM, eSIM and pocket Wi-Fi comparison guide. Links open in a new tab.

SIM and eSIM tutorial

Compare travel SIM, eSIM and roaming Check phone compatibility, voice-call needs, activation timing and setup before buying a connection for Japan. Open the SIM guide → Official free Wi-Fi

Japan Wi-Fi auto-connect hotspot map on a smartphone

Find free Wi-Fi with Japan Wi-Fi auto-connect Use the official app and hotspot map to find supported free Wi-Fi around Japan. Find free Wi-Fi → Free Wi-Fi for visitors

SoftBank FREE Wi-Fi PASSPORT on a smartphone

Use SoftBank FREE Wi-Fi PASSPORT Register with a phone number or email address to use participating SoftBank hotspots across Japan for free. See hotspots and setup → Official airport guide

Free Wi-Fi information for major Japanese airports

Check free Wi-Fi at major Japanese airports JNTO links to free Wi-Fi information for Narita, Haneda, Kansai, New Chitose, Chubu and Fukuoka airports. See airport Wi-Fi options → Optional travel data Affiliate link

Traveler collecting a physical travel SIM at a Japanese airport counter

Get online with a Sakura Mobile travel eSIM or SIM If free Wi-Fi is not enough, compare short-term eSIM and physical SIM options. Check phone compatibility, activation timing, data allowance and support before buying. Check Sakura Mobile options →

Public Wi-Fi may be unencrypted, so avoid banking, purchases and other sensitive transactions. Sakura Mobile is a paid third-party service. When its card is labeled “Affiliate link,” Japan Joy Guide may earn a commission at no extra cost to you. For more paid eSIM, SIM and pocket Wi-Fi comparisons, continue to the dedicated SIM and eSIM guide above.