Internet access in Japan: SIM, eSIM and Wi-Fi

Compare SIM cards, pocket Wi-Fi and free public Wi-Fi for visiting Japan, including the conditions to check before choosing, using only official guidance and no operator prices.

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  • Before you go
上網方式示意插圖：SIM 卡、Wi-Fi 分享器與手機，背景為日本風景

There are several ways to access the internet in Japan: use a Japanese SIM card, rent a pocket Wi-Fi router or connect to public free Wi-Fi. This page summarises official guidance from JNTO and Fukuoka Airport and sets out what to check before choosing. Commercial prices and plans change frequently, so this page does not list operator prices or rank providers.

Key points

  • JNTO’s JAPAN Mobile Tips introduces two types of service: SIM cards and Wi-Fi routers.
  • To use a Japanese SIM card, your phone must be SIM-free (not locked to a mobile operator) and bear a technical conformity mark for specified radio equipment.
  • For a Wi-Fi router, check that your phone supports Wi-Fi. JNTO recommends booking online in advance to ensure availability at your preferred time; the router must be returned after use.
  • Fukuoka Airport offers free Wi-Fi, but data is not encrypted, and connection records are retained.
  • JNTO’s pages do not cover eSIM. Whether eSIM can be used depends on the phone model and the provider’s information.

Comparing the options

Option Conditions in official guidance Suitable for
SIM card Phone is SIM-free; has a technical conformity mark; SIM size must fit the phone (standard, micro or nano); network settings must be configured after insertion People who want to use their own phone without carrying another device
Wi-Fi router Phone supports Wi-Fi; advance reservation recommended; return required after use; turn on the router, select its network on the phone and enter the password Groups sharing one connection, or people whose phones cannot change SIM cards
Free Wi-Fi Usage procedures and available hours vary by provider; you need your own device Supplementary access rather than the sole way of connecting

Questions to ask before choosing

  1. Can your phone use a different SIM? If it is not SIM-free, ask your existing mobile operator first.
  2. Are several people travelling together? Multiple people can share one Wi-Fi router, while SIM cards are used one per person.
  3. Where will you collect it? Providers differ: book online before arrival or collect from an airport or city counter. Check each provider’s official information.
  4. Do you have a backup option? Free Wi-Fi may fail to connect in some locations.

Free Wi-Fi at Fukuoka Airport

According to the official page:

  • Network names (SSID): AirportFreeWiFi-2.4G and AirportFreeWiFi-5.0G. Depending on the phone, only the 2.4G network may appear.
  • The service is free, but users are responsible for any charges arising from internet access.
  • After connecting, open a browser, agree to the terms as instructed on screen and select the displayed link.
  • Communications are logged; data between your phone and the wireless network is not encrypted.
  • Connections may fail in some shops or restaurants, outside the coverage area or when the network is busy.
  • The airport neither rents nor sells computers; bring your own device.

Avoid entering passwords or credit-card details on this type of network.

Official information

Further reading

  • Fukuoka Airport to central Hakata transport guide
  • Fukuoka travel guide

Sources