Japan SIM Card Guide

Japan has near-universal 4G coverage and growing 5G infrastructure. Even mountain towns, rural stations, and smaller islands have reliable signal. One detail that surprises first-time visitors: mobile signal works through subway tunnels and underground stations in Tokyo and Osaka. Most countries don’t. Getting connected on arrival is straightforward: install an eSIM before you board, pre-order a physical SIM for airport collection, or buy one at an arrivals counter. The choice between them comes down to your phone, your trip length, and one question most guides skip: do you actually need a Japanese phone number?

For everything else you need before arriving, see the Travel to Japan guide.

Do You Need a Local Japanese Number?

For most tourists, no. The apps you’ll rely on most (Google Maps, transport navigation, Uber Japan, and IC card apps) all work without a Japanese phone number. Tourist SIMs in Japan are almost universally data-only for this reason, and that’s rarely a problem in practice.

The one exception worth knowing: PayPay, Japan’s dominant QR payment app, requires a Japanese phone number to register. This means tourists cannot use PayPay regardless of which SIM they buy. For a full picture of where cards work, where cash is still essential, and which payment tools are available to tourists, see the Cash or Card in Japan guide.

One IC card clarification: Welcome Suica Mobile, the tourist-friendly iPhone app from JR East, runs through Apple Pay, not through your SIM or phone number. You don’t need a Japanese number or a local SIM to use it. A foreign card linked to Apple Pay is all it takes.

eSIM vs Physical SIM

eSIM: buy before you fly

Install at home on your regular WiFi connection before boarding. The eSIM activates automatically when your phone connects to the Japanese network on landing. No queue, no cash, no counter. For frequent travellers with compatible phones, it’s the simplest option.

The trade-offs: eSIMs for Japan are data-only (no Japanese phone number), and your phone must support eSIM and be carrier-unlocked. Check compatibility before purchasing; most iPhones from the XR onward and recent Android flagships support eSIM, but budget and older models often do not. You cannot install an eSIM in-flight or anywhere without a WiFi connection.

Physical SIM: buy at airport or pre-order

Works on any unlocked phone, offers more package variety, and is easier to troubleshoot if something doesn’t activate. Buying at an airport counter costs a little more than pre-ordering online, but you leave the arrivals hall already connected. Keep your home SIM somewhere safe while it’s out of the tray. A small envelope in your wallet works well.

Pre-ordering online for airport collection is the middle path: city pricing, airport convenience.

Which Network?

Japan’s three major networks (NTT Docomo, SoftBank, and au by KDDI) all deliver strong coverage across Tokyo, Osaka, Kyoto, and every major city. For a city-focused trip, the difference between them is minimal.

If your itinerary includes rural areas, smaller islands, or mountain regions (Hakone, Nikko, the Japan Alps, or the Yaeyama Islands), choose Docomo or a provider running on the Docomo network. It has the widest infrastructure outside urban centres and the most reliable signal in areas where other networks thin out.

Rakuten Mobile is Japan’s fourth carrier: newer network, lower prices, but coverage gaps outside major cities make it less suited for first-time visitors with varied itineraries.

Tourist SIM Options

IIJmio Travel SIM

One of the most widely available tourist SIMs in Japan, sold at Bic Camera counters inside Narita Terminal 1 and Terminal 2 arrivals halls, and at electronics stores nationwide. Runs on Docomo and au networks. Data-only; plans start from around ¥2,200–2,500 for 7–15 days. A straightforward option for travellers who want to buy on arrival without pre-ordering.

Docomo Tourist SIM

Available directly from NTT Docomo counters at Narita and Haneda. Data-only plans for 7–30 days. Buying direct from the carrier means English-speaking staff and reliable activation. Slightly higher in price than MVNO options, but strong rural coverage and no compatibility surprises.

Sakura Mobile

Pre-order online before departure for pickup at Narita, Haneda, or delivery to your first hotel in Japan. Runs on the Docomo network. Strong English-language support, useful if you want to troubleshoot activation in English. Plans from around ¥3,500–5,000 for 8–30 days.

eSIM Options

Two platforms cover most of the tourist eSIM market for Japan. Airalo offers Japan-specific plans across several data and duration tiers, with options ranging from a few days to 30 days. Compare the daily data allowance before buying; plan names vary and the per-GB value differs significantly between short and longer-stay options. Holafly sells unlimited daily data plans at a flat rate per duration, which suits longer stays or anyone who doesn’t want to track a daily cap. Both install and activate the same way.

Install any eSIM before you leave home on a WiFi connection. You cannot install an eSIM on the plane or without internet access. Once installed, it activates automatically on landing. No further steps needed.

All travel eSIMs for Japan are currently data-only. For voice calls, use WhatsApp, FaceTime, or Google Meet over your data connection instead.

Where to Buy at the Airport

Narita, Haneda, and Kansai International all have SIM counters in their international arrivals areas. Passport is mandatory for registration. Japanese law requires it for all SIM purchases, and no counter will sell without it.

Narita (NRT)

• Terminal 1 and Terminal 2 both have SIM counters in the arrivals hall, before the ground transport exit
• Bic Camera operates a counter inside both terminals selling IIJmio and other tourist SIMs
• Docomo, SoftBank, and au each have staffed counters: bring your passport and expect a 5–10 minute process

Haneda (HND)

• International terminal arrivals hall has staffed counters from Docomo, SoftBank, and au
• Bic Camera counter in the international terminal
• Smaller selection than Narita but all main options are represented

Kansai International (KIX)

• Terminal 1 arrivals hall has staffed SIM counters from Docomo, SoftBank, and au
• IIJmio tourist SIMs available at electronics retail counters in the arrivals area
• The main arrival point for visitors heading to Kyoto, Osaka, and Nara; SIM options are equivalent to Narita and Haneda

Pre-Order vs Buy at the Counter

Pre-ordering online (whether for an eSIM or a physical SIM to collect at the airport) is consistently cheaper than buying at arrivals counters on the day. Airport convenience carries a price premium. If you have 24 hours before departure, ordering online is worth it.

For pre-ordered physical SIMs, most providers have collection points at Narita T1, Narita T2, and the Haneda international terminal. Confirm the collection desk location when ordering; it’s usually separate from the retail counters and faster to get through.

The “Unlimited” Data Caveat

Most tourist SIM plans marketed as unlimited throttle speeds after a daily high-speed data cap, typically 2–3GB per day at full 4G or 5G speeds. After that, speeds drop to around 384Kbps. That’s sufficient for maps, messaging, and light app use; it’s not enough for video calls, streaming, or large file downloads.

This applies to most tourist SIMs including IIJmio and standard Docomo tourist plans. Check the daily high-speed cap before buying. If you plan to work remotely, stream video, or make frequent video calls, look specifically for plans with a higher daily cap or plans that explicitly state no daily throttle. One separate restriction worth checking: tethering (using your phone as a hotspot for a laptop or tablet) is prohibited on many tourist SIM plans. Confirm tethering is permitted before buying if you need it.

Pocket WiFi

A pocket WiFi device provides a single mobile connection that multiple people can share, useful for families or groups where each person doesn’t want their own SIM, or for anyone with a carrier-locked phone that can’t accept a tourist SIM.

The trade-off is a separate device to carry and charge daily. Battery life typically runs 8–10 hours, so a long day of exploring requires carrying a power bank or returning to base to recharge. Rentals are available at the same airport counters as physical SIMs, starting from around ¥600–800 per day.

For solo travellers or anyone with an eSIM-compatible phone, a SIM or eSIM is simpler and cheaper. Pocket WiFi makes the most sense when three or more people are splitting the cost.