TL;DR: If your phone doesn't support eSIM, you have three practical alternatives to stay connected in Japan: a prepaid physical SIM card (available at airports and convenience stores), a pocket WiFi device (ideal if you're traveling with multiple devices), or a rental phone at the airport. If you're upgrading your smartphone before your trip, or if you're traveling with someone who has a compatible device, a PlanJapan eSIM is the simplest, most affordable, and most hassle-free option.
How to Check If Your Phone Is eSIM Compatible
Before looking for alternatives, verify that your phone is actually incompatible. The check takes under 30 seconds.
On iPhone
- Go to Settings > General > About
- Scroll down to find "EID" (or "EID Number")
- If this field appears → your iPhone supports eSIM
On Android (Samsung, Google Pixel, OnePlus...)
- Go to Settings > About Phone
- Look for "eSIM" or "Embedded SIM" in the status information
- On Samsung: Settings > Connections > SIM Manager — if you see "Add eSIM", your device is compatible
You can also dial *#06# and press call: if a 32-digit EID code appears on screen, your device supports eSIM.
eSIM-Compatible Models (Reference List)
Compatible iPhones: all models since iPhone XS (2018) — iPhone XS/XS Max/XR, 11, SE 2nd and 3rd gen, 12, 13, 14, 15, 16, and 17.
Compatible Samsung Galaxy: Galaxy S21/S22/S23/S24/S25/S26, Galaxy Z Fold 3/4/5/6/7, Galaxy Z Flip 3/4/5/6/7, Galaxy A54/A55/A56.
Compatible Google Pixel: Pixel 4 and all subsequent models (Pixel 5, 6, 7, 8, 9, 9a).
If your device isn't on these lists, it's likely too old for eSIM — or it may be a regional variant without an eSIM chip.
Why Your Phone May Not Be eSIM Compatible
1. Older device without an eSIM chip
eSIM technology only appeared in consumer smartphones in 2018. If your device is more than 7 years old, it simply doesn't have an embedded eSIM chip. There's no technical workaround to add eSIM to a phone that wasn't built with one.
2. Carrier-locked phone
Important distinction: a carrier-locked phone is not the same as an incompatible one. Some devices technically support eSIM but are locked to your home carrier, preventing them from using SIM cards from other providers. A simple unlock request to your carrier is usually enough — often free after 3–6 months on contract. See our guide: Do You Need to Unlock Your Phone for Japan eSIM?
3. Regional variant without an eSIM module
Some smartphones are sold in different versions depending on the market. Chinese or Southeast Asian variants of certain Samsung Galaxy or Xiaomi models may not include an eSIM chip, even if the international version does. Check the exact model number of your device (found in Settings > About Phone).
3 Alternatives to Stay Connected in Japan Without eSIM
If your phone is genuinely incompatible — too old, no eSIM chip, and can't be unlocked before your trip — here are your concrete options.
Option 1: Prepaid Physical SIM Card (Simplest Option)
Physical SIM cards remain the most accessible alternative. In Japan, several operators offer tourist data SIM cards with no contract or commitment, available right when you land.
Where to buy a physical SIM in Japan:
- Narita and Haneda airports: IIJmio, b-mobile, and Sakura Mobile counters — available upon arrival before customs
- Convenience stores (7-Eleven, Lawson, FamilyMart): some carry prepaid SIM cards
- Electronics retailers (Yodobashi Camera, Bic Camera) in Tokyo, Osaka, and Kyoto city centers
Main tourist SIM operators:
- IIJmio: 3–10 GB cards valid for 15–30 days, great value on the NTT Docomo network
- b-mobile: data-only cards for 7–21 days, budget-friendly
- Sakura Mobile: data + local calls option, ideal if you need a Japanese phone number
Pros: no internet connection required to install (unlike eSIM), works with any phone that has a nano-SIM slot, immediately available at the airport.
Cons: you'll need to remove your home SIM card (risk of losing it), and some cards require activation via an app.
Option 2: Pocket WiFi (Best for Groups or Multiple Devices)
A pocket WiFi is a small portable router that creates a local WiFi network. Slip it in your pocket and up to 10 devices can connect simultaneously — smartphone, tablet, laptop. Rent it before departure from providers like Global WiFi or Ninja WiFi, or pick one up at the airport on arrival.
Pros: connects multiple devices at once (great for couples or families), works with any WiFi-capable device, solid coverage on NTT Docomo or SoftBank networks.
Cons: extra device to carry and charge every night (8–10 hours battery), higher cost (€8–15/day), significant replacement fees if lost or damaged.
For a detailed comparison between eSIM and pocket WiFi, see our guide: Japan eSIM vs Pocket WiFi: Which Should You Choose?
Option 3: Rental Phone at the Airport
Major Japanese international airports (Narita, Haneda, Kansai) have phone rental counters. This option is niche and expensive (€5–15/day), but it can be useful if you absolutely need a local Japanese phone number for bookings or professional purposes. For basic internet access, a physical SIM or pocket WiFi will always be more cost-effective.
Comparison of the 3 Alternatives
| Option | Estimated Cost | Pros | Cons |
|---|---|---|---|
| Physical SIM card | €15–40 for 7–15 days | Simple, airport-ready, no WiFi needed | One device only, must swap home SIM |
| Pocket WiFi | €8–15/day | Multi-device, good coverage | Extra device, daily charging, higher cost |
| Rental phone | €5–15/day | Japanese number, eSIM-compatible | Expensive, inconvenient for tourist use |
Frequently Asked Questions
My phone has neither a SIM slot nor eSIM — what now?
Some devices (older WiFi-only smartphones, tablets without cellular) have neither a SIM slot nor an eSIM chip. In that case, a pocket WiFi is your only option: a portable router you connect to over WiFi. Rent one before departure or pick it up at Narita or Haneda airport on arrival.
Can I just rely on public WiFi in Japan?
Japan has an extensive network of free public WiFi at train stations (JR East, Tokyo Metro), convenience stores, cafés (Starbucks, McDonald's), and major tourist attractions. However, these connections are often unreliable, unavailable on the Shinkansen or in rural areas, and not suitable for consistent mobile use throughout a full trip.
Will a Japanese physical SIM work in a carrier-locked phone?
No. A phone locked to your home carrier won't accept a foreign physical SIM card either. In that case, request an unlock from your carrier before departure — it's usually free and straightforward. See our guide: Carrier Unlock for Japan eSIM.
My next phone will support eSIM — which plan should I get for Japan?
If you're upgrading your smartphone before your trip, PlanJapan eSIM is the simplest and most affordable option. Activate in 2 minutes via QR code, on the NTT Docomo 4G/5G network covering over 99% of Japan, with no contract or hidden fees. For a standard 2-week trip, the 50 GB plan is our top recommendation.
What's the difference between a physical SIM and an eSIM?
A physical SIM is a removable chip you insert into your phone's SIM tray. An eSIM is an electronic chip soldered inside the device, programmed remotely via a QR code. eSIM eliminates the need for physical handling, reduces the risk of losing your home SIM, and lets you activate your connection from home before you even leave.
Our Recommendation
If your phone isn't eSIM compatible, here's our advice based on your situation:
- Traveling solo: get a prepaid physical SIM card at Narita or Haneda airport when you arrive. Quick, simple, and affordable.
- Traveling as a group (2+ people): a pocket WiFi connects all your devices at once — convenient when not everyone has a compatible phone.
- Planning to upgrade your phone: wait until you have your new eSIM-compatible smartphone, then order a PlanJapan eSIM. Simpler, cheaper, no extra device to manage.
- Traveling with someone who has a compatible phone: PlanJapan eSIM is the ideal solution for your travel companion. For most 2-week trips, the 50 GB plan covers everything without any restrictions.