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What This Guide Covers
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Japan's Unique Mobile Market
Japan's mobile market works differently from most countries. The three major carriers (NTT Docomo, au (KDDI), and SoftBank) don't sell prepaid SIMs to tourists directly. Instead, tourists buy data-only SIMs from MVNOs (mobile virtual network operators) like IIJmio, b-mobile, and Sakura Mobile that use the big three's networks.
The critical thing to understand is that voice SIM cards with a Japanese phone number are extremely difficult for tourists to obtain. Japanese telecoms law requires residency documentation for voice service. As a tourist, your options are data-only SIMs (which work perfectly for WhatsApp, Google Maps, and all internet-based calls) or pocket WiFi rental devices.
Data-Only: No Voice Calls
Almost all tourist SIMs in Japan are data-only. You cannot make or receive regular phone calls. Use WhatsApp, LINE (Japan's most popular messaging app), FaceTime, or Skype for voice and video calls over data. This is perfectly normal in Japan, since most Japanese people use LINE for calls anyway.
IIJmio Japan Travel SIM
IIJmio Japan Travel SIM: Most Reliable Data SIM
Well-established MVNO on Docomo's network with excellent coverage across Japan
IIJmio (pronounced "eye-eye-jay-mio") is one of Japan's most established MVNOs, running on NTT Docomo's network, the carrier with the best nationwide coverage including rural areas. Their travel SIM comes in 3 GB and 10 GB options, both valid for 30 days. It's available at major airports and BIC Camera electronics stores nationwide.
Strengths
Weaknesses
b-mobile Visitor SIM
b-mobile Visitor SIM: Flexible Duration Options
Tourist-specific SIM with multiple plan durations on Docomo or SoftBank
b-mobile's Visitor SIM is specifically designed for tourists and comes in tiered plans that match common trip lengths. The 7-day 5 GB plan at around ¥1,980 is popular for short Tokyo trips. Some versions run on SoftBank's network instead of Docomo, so check the packaging to know which you're getting.
Convenience Store SIMs
Convenience Store Travel SIMs
Available 24/7 at 7-Eleven, Lawson, and FamilyMart across Japan
Japan's legendary convenience stores (konbini) are a backup option for buying data SIMs. Many 7-Elevens, Lawsons, and FamilyMarts have SIM card vending machines or stock prepaid data SIMs at the counter. The advantage is 24/7 availability: if you arrive on a late flight and the airport counters are closed, a convenience store near your hotel can get you connected. The downside is limited plan options and sometimes confusing Japanese-only packaging.
Japan Data SIM Plans Compared
| Provider | Data | Duration | Network | Price |
|---|---|---|---|---|
| IIJmio Travel | 3 GB | 30 days | Docomo | ~$11 |
| IIJmio Travel | 10 GB | 30 days | Docomo | ~$22 |
| b-mobile Visitor | 5 GB | 7 days | Docomo/SoftBank | ~$14 |
| b-mobile Visitor | 10 GB | 21 days | Docomo/SoftBank | ~$27 |
| Airalo eSIM | 3 GB | 30 days | Docomo/SoftBank | $11 |
| Ubigi eSIM | 10 GB | 30 days | SoftBank | $16 |
Where to Buy a SIM Card in Japan
Narita Airport (NRT) or Haneda Airport (HND)
Both Tokyo airports have SIM card counters in the arrivals area. Look for the "Visitor SIM" or "Tourist SIM" signs. At Narita, counters are in Terminal 1 and 2 arrivals. At Haneda, they're in the International Terminal arrivals area. Some counters also rent pocket WiFi devices. Staff speak English.
Kansai Airport (KIX) and Other Airports
Osaka's Kansai airport has multiple SIM counters in arrivals. Fukuoka, Sapporo (New Chitose), and Naha (Okinawa) airports also have options, though fewer than Tokyo airports. For smaller regional airports, buy an eSIM before your trip.
BIC Camera and Yodobashi Camera
Japan's large electronics store chains stock tourist data SIMs. BIC Camera stores near major train stations (Shinjuku, Shibuya, Osaka Station) have English-speaking staff in the SIM section. These are often the cheapest in-store option.
Convenience Stores (24/7 Backup)
If airport counters are closed or you arrive late, check the nearest 7-Eleven, Lawson, or FamilyMart for SIM vending machines. Not every location has them, but stores near airports and major train stations usually do.
eSIM vs Physical SIM in Japan
Japan is a country where we strongly recommend an eSIM over a physical SIM. Here's why:
| Factor | eSIM | Physical SIM |
|---|---|---|
| Setup | Before your flight, instant | At airport counter, 10–20 min wait |
| Voice calls | Data only (same as physical) | Data only |
| Price (10 GB) | $11–16 (Airalo/Ubigi) | $22–27 (IIJmio/b-mobile) |
| Top-up | Easy via app | Must buy new SIM |
| Coverage | Same Docomo/SoftBank networks | Same networks |
Since both options are data-only anyway, the eSIM wins on every practical measure: it's cheaper, faster to set up, and lets you top up through an app. The only reason to buy a physical SIM in Japan is if your phone doesn't support eSIM.
Japan-Specific Tips
Practical Advice for Staying Connected in Japan
Download LINE: LINE is Japan's dominant messaging app; it's how Japanese people communicate. Many restaurants, tour operators, and Airbnb hosts will want to contact you via LINE. Download it and register before your trip.
Google Maps works perfectly: Japan has excellent Google Maps coverage with accurate transit directions, walking routes, and restaurant information. Your data SIM + Google Maps is your best friend for navigating the train system.
Free WiFi exists but is limited: Japan has improved its free WiFi significantly, but it's still not as ubiquitous as in South Korea or the US. Hotels and major train stations have it, but don't rely on WiFi alone.
Rural coverage is excellent: Unlike many countries, Japan's rural areas have strong 4G coverage. Even in the mountains of Hokkaido or the countryside of Kyushu, Docomo's network reaches almost everywhere.
Passport needed for purchase: You'll need to show your passport when buying a SIM at the airport or electronics store. This is a quick check, not a lengthy registration process.
Consider Pocket WiFi for Groups
If you're traveling with family or friends, a pocket WiFi rental device may be more cost-effective than buying individual SIMs. You can rent them at the airport for ¥500–1,000/day with unlimited data and connect up to 10 devices. Return the device at the airport when you leave.
Frequently Asked Questions
Can I get a SIM with voice calls in Japan?
Practically speaking, no. Japanese telecoms regulations require a residence card for voice SIM contracts. As a tourist, you're limited to data-only SIMs. Use WhatsApp, LINE, FaceTime, or Skype for calls over your data connection.
Is a pocket WiFi device better than a SIM?
For solo travelers, a SIM (or eSIM) is more convenient, since it's one less device to carry and charge. For groups of 2+ people, a pocket WiFi can be more economical since everyone connects to the same device. The trade-off is remembering to charge it daily and keeping it with you at all times.
Will my SIM work on the Shinkansen (bullet train)?
Yes. All major carriers have coverage along Shinkansen routes. You'll have consistent 4G in stations and good coverage on the trains, though speeds may fluctuate as you travel at 300 km/h. Some Shinkansen lines also have onboard WiFi.
Do I need data for Japan's trains?
Having data access is extremely helpful for navigating Japan's train system. Google Maps and the Japan Transit app (Navitime) provide real-time schedules and transfer instructions. Japan's rail system is complex, and having a data connection makes it much easier.
Can I buy a SIM at a convenience store?
Some convenience stores near tourist areas and airports have SIM vending machines or sell prepaid data SIMs. But the selection is limited, packaging is often in Japanese, and prices are higher than at the airport or electronics stores. Use this as a backup option, not your first choice.