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Getting online in Japan: eSIM, roaming or pocket Wi-Fi?

For most visitors a data-only eSIM is the cheapest choice: about US$8 for 3GB over 7 days, installed before you fly, while your own number keeps receiving SMS codes. Roaming from home is the easiest, and pocket Wi-Fi suits a family sharing one connection. Prices are from each company’s site, checked on 30 October 2026.

By Mikako Yoshida ·Published 28 October 2026 · Updated 30 October 2026

Getting online in Japan: eSIM, roaming or pocket Wi-Fi?
Haneda Airport Terminal 3 · Photo: MaedaAkihiko (CC BY-SA 4.0)

Which one for you

OptionBest forTypical priceWatch out for
Travel eSIM (Airalo, Saily, Yesim)Phones that support eSIM; most tripsUS$8–11 for 3–5GB over 7 days; unlimited from US$26.50 for 7 daysData only: no Japanese phone number
Roaming from your home carrierNo setup; short tripsNT$129–149 a day from Taiwan; ₩11,000 a day with KTAdds up on long trips; speed drops after the daily allowance
Pocket Wi-FiFamilies or groups sharing one connectionDaily rental per deviceCollect and return the device; one more battery to charge
Free airport Wi-FiArrival day, before your eSIM is onFreeOnly inside the airport
Shibuya Crossing, Tokyo, at night
Shibuya Crossing, Tokyo, at night · Photo: Espen Faugstad from Oslo, Norway (CC BY 2.0)

Pick by your trip

Your tripWhat to get
Travelling alone or as two, phone supports eSIMA travel eSIM, installed before you fly
3–5 days, light use (maps, messaging, train times)A 3–5GB plan
1–2 weeks, with photos, translation and video10–20GB, or an unlimited plan with a daily full-speed allowance
A family sharing, or a phone without eSIMPocket Wi-Fi, or a physical SIM card
Phone locked to a carrierAsk your carrier to unlock it first; no travel eSIM works until then

Japan eSIM prices (US$, checked 30 October 2026)

DataAiraloSailyYesim
1GBUS$4.00 (3 days)US$3.99 (7 days)US$4.44 (30 days)
3GBUS$7.50 (3 days), US$8.00 (7 days)US$7.99 (30 days)–
5GBUS$10.00 (7 days), US$10.50 (15 days), US$11.00 (30 days)US$10.99 (30 days)US$10.56 (30 days)
10GBUS$17.00 (7 days), US$17.50 (15 days), US$18.00 (30 days)US$17.99 (30 days)US$19.20 (30 days)
20GBUS$24.00 (15 days), US$25.00 (30 days)US$24.99 (30 days)US$29.76 (30 days)
Unlimited, 7 daysUS$26.50US$26.99US$29.40
Unlimited, 30 daysUS$69.00US$71.99US$66.00
Network in JapanSoftBank, plus two other networksKDDI and SoftBankKDDI

Estimate your data

Hours a day on…

Cheapest plan that is big enough and lasts long enough (checked 30 October 2026):

    Buy: Airalo · Saily · Yesim · Klook · KKday

    Rough use per hour: maps 30 MB, web and messaging 100 MB, social media and standard-quality video 700 MB, video calls 540 MB.

    Plans from docomo, SoftBank and au (KDDI) in a Japanese electronics store
    Plans from docomo, SoftBank and au (KDDI) in a Japanese electronics store · Photo: nagi usano from Tokyo, Japan (CC BY-SA 2.0)

    Choosing a plan

    Maps, messaging and translation apps use little data, so 5GB is usually enough for a week unless you stream video or share the connection. “Unlimited” plans slow down after a daily amount: Airalo to 1Mbps after 3GB a day, Saily after 5GB a day.

    Compare the network as well as the price, since coverage in the mountains and on trains differs by carrier. Saily and Yesim say hotspot sharing is included; Airalo’s Japan page does not say. Yesim plans must be activated within 90 days of purchase.

    Saily and Yesim sell unlimited plans for any number of days from 1 to 30, Airalo for 3, 5, 7, 10, 15 or 30 days. Saily plans start automatically 180 days after purchase if you have not started them yourself.

    Buy: Airalo, Saily, Yesim. Klook and KKday also sell Japan eSIMs priced in your own currency, including daily unlimited plans.

    Setting up an eSIM

    1. Check your phone

      iPhone XS, XR and later models support eSIM, and the phone must not be locked to a carrier: on an iPhone, Settings > General > About shows “No SIM Restrictions” next to Carrier Lock. Some iPhones sold in Hong Kong and Macao take two physical SIM cards instead.

    2. Install it before you fly

      Buy the plan and scan its QR code at home over Wi-Fi, so it is ready when you land.

    3. Switch over when you land

      Set mobile data to the travel eSIM and turn on data roaming for that line. Keep your home line on for calls and SMS codes, but turn off its data roaming so your carrier does not charge you.

    4. Top up before you run out

      Airalo, Saily and Yesim all sell top-ups in their apps, and Saily can top up automatically. Top up on hotel Wi-Fi rather than waiting until the data is gone, and do not delete the eSIM from your phone: most can be installed only once.

    Useful before you fly

    eSIM for Japan, installed before you leave home

    Airalo Saily Yesim

    JR Pass and Shinkansen tickets

    Klook KKday

    Airport transfer when you have a lot of shopping bags

    Klook Trip.com Welcome Pickups

    Luggage storage in Tokyo for the hours before an evening flight

    Radical Storage

    Hotels in Japan

    Klook Trip.com

    Coupons

    Arrivals lobby, Narita Airport Terminal 2
    Arrivals lobby, Narita Airport Terminal 2 · Photo: Nanashinodensyaku (CC BY-SA 4.0)

    Roaming from home (checked 28 October 2026)

    CarrierJapan planPrice
    Chunghwa Telecom (Taiwan)Daily plan, 2GB a day at full speedNT$149 a day
    Taiwan Mobile4–30 days, online price until 30 November 2026NT$129 a day
    FarEasTone (Taiwan)4–30 days, 2GB a day at full speedNT$129 a day
    SKT baro (Korea)3GB for 30 days, 195 countries₩29,000
    KT (Korea)Daily roaming basic, 1GB a day₩11,000 a day
    Free public Wi-Fi sign in Kyoto
    Free public Wi-Fi sign in Kyoto · Photo: Nori Norisa (CC BY 2.0)

    Pocket Wi-Fi and free airport Wi-Fi

    A pocket Wi-Fi router shares one connection with several phones, which can work out cheaper for a family. Ninja WiFi rents them by the day, with pick-up counters at Narita, Haneda and Kansai airports.

    Narita (FreeWiFi-NARITA) and Haneda (HANEDA-FREE-WIFI) have free Wi-Fi in every terminal: enough to switch on your eSIM or look up the route to your hotel when you land.

    Keep data working on your last day

    From 1 November 2026, tax-free purchases are refunded after the customs check when you leave, and some refund companies ask you to register a card in an app or on a website. Make sure your plan still covers the day you fly home. At the airport, do the customs kiosk check before you check in any bag: see where the kiosks are at Narita, Haneda and Kansai.

    Phone charging lockers in Japan
    Phone charging lockers in Japan · Photo: Ian Kennedy (CC BY-SA 2.0)

    Questions

    Do I need a Japanese phone number?
    No. A data-only eSIM covers maps, messaging, payment and ride-hailing apps. Keep your home line on if your bank sends SMS codes.
    eSIM or a physical SIM card?
    If your phone supports eSIM, it is easier: no card to swap or lose, and you can install it at home. A physical data SIM is only needed for phones without eSIM.
    Can I make LINE or WhatsApp calls?
    Yes. Calls in these apps use data, so they work on any data plan.
    Will my LINE account or number change?
    No. LINE stays tied to your own account and number; the eSIM only carries the data, so your chats and friends stay as they are.
    What happens when the data runs out?
    On a fixed plan the data stops until you top up in the app. On an unlimited plan the speed drops to 1Mbps after the daily allowance (Airalo 3GB, Saily 5GB a day) until the next day.
    Can I share the connection with a laptop or my family?
    Saily and Yesim say hotspot sharing is included; Airalo’s Japan page does not say. Sharing uses data and battery quickly, so keep an eye on a fixed plan.

    Related guides

    Japan trip checklistEntry steps and costs in the order you meet them.Tax refund at the airportWhere to do the customs check when you leave.Getting your refundTo a card, in cash or to an e-wallet, and how long each takes.

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