eSIM vs Pocket WiFi vs SIM Card for Japan (2026)
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- Your phone supports eSIM and you're travelling solo or as a couple? Get an eSIM. It's the cheapest, there's nothing to pick up or return, and it works the moment you land.
- Group or family sharing one connection, or several devices (laptop, tablet)? A pocket WiFi can work out cheaper per person.
- Phone doesn't support eSIM? A physical data SIM, or a pocket WiFi.
Quick comparison
| eSIM | Pocket WiFi | Physical SIM | |
|---|---|---|---|
| Typical cost | About $4–8 for 1–3 GB / 7 days; about $16–18 for 10 GB / 30 days; unlimited about $26–29 for 7 days | Rented per day; cost is shared by everyone connected | Varies by seller; usually more than an eSIM for the same data |
| Setup | Scan a QR code before you fly | Collect at the airport or hotel, return by post or at the airport | Swap SIM on arrival |
| Extra things to carry | None | Device + charging | Keep your home SIM safe |
| Phone number | Usually data-only | No | Usually data-only |
| Best for | Most travellers | Groups, multiple devices | Phones without eSIM |
Option 1: eSIM (best for most visitors)
An eSIM is a digital SIM you install by scanning a QR code. Most iPhones from the XS onward and many recent Android phones support it. Your home SIM stays in the phone, so you can still receive texts such as bank verification codes.
Travel eSIMs for Japan run on the major local networks — NTT Docomo, au (KDDI), SoftBank or Rakuten Mobile — so coverage in cities, at airports and along the main train lines is strong.
How much data do you need?
- Maps, messaging, a few photos uploaded: roughly 1 GB per 3–4 days.
- Heavy social media, video calls: 1–2 GB per day. Consider an unlimited plan.
- Most hotels have free WiFi, so you mainly need data while out during the day.
Example plans
Airalo's Japan plans ("Moshi Moshi") start at about $4.50 for 1 GB / 7 days, with 10 GB / 30 days at about $18 and 20 GB / 30 days at about $26.
See Airalo Japan plans See Saily Japan plans
Before you buy: check your phone is unlocked
An eSIM only works if your phone is carrier-unlocked. On iPhone, go to Settings → General → About and look for "Carrier Lock: No SIM restrictions". If it says otherwise, contact your carrier before your trip.
Option 2: Pocket WiFi
A pocket WiFi is a small router you rent for your trip. Several phones and laptops can connect at once, which is why it makes sense for families and groups.
The downsides: one more device to keep charged, everyone has to stay near whoever carries it, and you need to collect and return it.
Option 3: Physical SIM card
If your phone doesn't support eSIM, a prepaid data SIM is the alternative. You can order one online for airport pickup. Remember to keep your home SIM somewhere safe.
Frequently asked questions
Can I rely on free WiFi in Japan instead?
Free WiFi exists at hotels, many stations and convenience stores, but it's patchy on the move. You'll want data for maps and train apps between stops.
Will I get a Japanese phone number?
Most travel eSIMs and SIMs are data-only. You can still call through WhatsApp, LINE or FaceTime. If you need a local number (for example, for some restaurant bookings), look specifically for a voice plan.
When should I install the eSIM?
Install it at home while on WiFi, but only switch it on when you land. Most plans start counting days from first connection in Japan. Check your provider's terms.
Bottom line
If your phone supports eSIM, get one before you fly. It's the cheapest and simplest choice for most visitors. Choose a pocket WiFi only if you're a group sharing one connection or need to connect several devices.
Related guides
- Japan in winter: 7 things to book in advance
- Narita & Haneda Airport to Tokyo
- How much mobile data do you need in Japan?
- Cash or card in Japan?
- Best Japanese snack box gift for the holidays
- Gifts for anime fans shipped from Japan
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