Updated: 2026-05-29 18:04:29
Heading to Japan and not sure if your phone supports eSIM — or how to actually set one up? This guide walks you through every step: checking compatibility, choosing a plan, installing the eSIM before departure, and activating it the moment you land.
The whole process takes under five minutes. No airport queues, no SIM card swaps.
If you've never heard of eSIM before, start with our [Beginner-Friendly] What Is an eSIM? guide first. Already familiar with the basics? Keep reading.
An eSIM is a "digital SIM card" built directly into your smartphone. By simply downloading a data profile, you can access cellular networks just like you would with a physical SIM card.
Say goodbye to fumbling with tiny chips and SIM ejector tools.
Purchase online and set it up instantly by scanning the QR code sent to your email.
Use "Dual SIM" mode to keep your home number active for calls while using a Japanese eSIM for data.
No need to wait in long lines at airport counters. You can add a Japanese plan as a "secondary line" without removing your original SIM. This allows you to receive important calls or texts on your primary number while enjoying affordable local data. Plus, there's zero risk of losing your original SIM card.
Forget about carrying a heavy extra device or worrying about its battery life every night. There’s no hardware to return, and it’s more battery-efficient for your phone. Best of all, since the connection is on your phone, group members can roam freely without losing signal by staying near a router.
Before anything else, confirm two things: your device supports eSIM, and it isn't carrier-locked.
Open your phone's dialer and type *#06#. If an "EID" number appears on screen, your device supports eSIM. No EID means you'll need a physical SIM card instead.
| Device | eSIM | 5G | Notes |
|---|---|---|---|
| iPhone 11 | ✓ Yes | No (4G LTE) | Dual SIM: nano-SIM + eSIM |
| iPhone 12 / 13 / 14 / 15 / 16 series | ✓ Yes | ✓ Yes | |
| iPhone 17 / 17e (2025) | ✓ Yes | ✓ Yes | Current lineup |
| Samsung Galaxy S21–S26 | ✓ Yes | ✓ Yes | eSIM standard from S21 onward |
| Google Pixel 6–10 | ✓ Yes | ✓ Yes | Reliable eSIM implementation |
| iPad Pro (M4) / Air (M2) | ✓ Yes | ✓ Yes | eSIM-only (no physical SIM slot) |
| iPhone X / 8 or earlier | ✗ No | — | Physical SIM required |
Note: Google Pixel 9 and 10 have documented incompatibility with Ubigi eSIMs, but work fine with CDJapan Rental.
Go to Settings → General → About → Carrier Lock. If it says "No SIM restrictions," you're ready to install a Japanese eSIM.
If your iPhone shows a carrier restriction, contact your carrier to request an unlock before you travel. iPhones purchased directly from Apple or sold as unlocked are already SIM-free.
On Android, check under Settings → Connections → SIM card manager (wording varies by manufacturer). When in doubt, contact the carrier you purchased the phone from.
CDJapan Rental offers two types of eSIM plans: fixed-data and unlimited.
If your usage is mainly maps, messaging, and social media, a fixed-data plan is the safer choice. The cap is predictable, so there are no surprises on your bill.
Traveling with heavy video streaming or frequent hotspot sharing? Unlimited plans have no total data cap and never cut your connection. After 3 GB of high-speed data in a single day, speeds are throttled — this is standard Fair Usage Policy (FUP) across the industry, not a CDJapan-specific restriction.
| Data | Days | Price |
|---|---|---|
| Unlimited | 5 days | ¥2,800 → |
| Unlimited | 10 days | ¥5,000 → |
| Unlimited | 15 days | ¥6,300 → |
| Unlimited | 31 days | ¥7,900 → |
Not sure which plan fits your trip? See our plan comparison guide (Unlimited vs 30 GB vs 50 GB).
CDJapan Rental runs on Japan's largest docomo network — instant delivery, no queues.
Check available plans →After purchasing, your QR code is available immediately in your CDJapan Rental My Page. Log in, go to your order, and you'll find the QR code and full setup instructions ready to use.
We recommend saving the QR code image from My Page before you leave home. This way, you're covered even if your confirmation email is delayed, lands in spam, or gets accidentally deleted — all common situations when traveling.
Once you're through arrivals, follow these steps to get online.
CDJapan eSIM supports hotspot sharing out of the box — no extra settings needed. If hotspot isn't working, try setting the APN manually. See the hotspot sharing guide for details.
If you're connected but not getting data, run through this list first:
Still stuck? Our full guides cover the most common issues in detail:
Not all Japan eSIMs work the same way. There are two fundamentally different types, and understanding the difference will save you a lot of frustration.
Most global eSIM services — Airalo, Holafly, Saily, and others — use roaming technology. When you open Google Maps or send a message in Japan, your data doesn't connect directly to a Japanese network. Instead, it routes through overseas servers, typically in China or Singapore, before coming back to Japan.
The practical result: even when the signal looks strong, pages load slightly slower, Google Maps takes a beat longer to respond, and streaming video buffers more than it should. You may also find that certain Japan-only services and apps don't work, because your connection appears to originate from outside the country. On top of that, roaming-type eSIMs require you to enable Data Roaming in your phone settings — which can sometimes trigger unexpected charges if your home carrier's roaming kicks in instead.
The practical result: low latency, full speed, and a genuine Japanese IP address. Japan-only apps and streaming services work exactly as they do for local residents. You also never need to enable Data Roaming — in fact, for CDJapan eSIM, Data Roaming should stay off.
If you're traveling for business, or you simply want a connection that just works without configuration headaches, a local-type eSIM is the right choice.
| Roaming-type eSIM (Airalo, Holafly, etc.) |
Local-type eSIM (CDJapan Rental) |
|
|---|---|---|
| How it connects | Via overseas server (China / Singapore → Japan) | Direct to Japan's docomo network |
| Latency | Higher — noticeable on maps & video | Low — same as local residents |
| Japan-only services | May be restricted | Fully accessible |
| Data Roaming setting | Must be ON | Leave OFF |
| IP address | Foreign IP | Japanese IP |
| Best for | Casual browsing where speed isn't critical | All use cases, especially business & navigation |
| Provider | Days | Data | Price | Network | FUP |
|---|---|---|---|---|---|
| CDJapan Rental | 15 | Unlimited | ¥6,300 | docomo (direct) | 3 GB/day then throttled |
| Holafly | 15 | Unlimited | ¥8,290 | Softbank/KDDI (roaming) | Undisclosed cap |
| Airalo | 15 | Unlimited | ¥8,050 | Softbank/KDDI (roaming) | 3 GB/day then throttled |
(Most Global Services)
Your data is routed through overseas servers (e.g., Hong Kong or Singapore) before returning to Japan. This creates constant latency (lag), making video streaming sluggish and web searches feel unresponsive. You also typically have to enable "Data Roaming" in your settings.
(Powered by CDJapan)
Connects directly to Japanese networks without overseas routing.
For the best experience in Japan, a "Japan-Native" eSIM is the superior choice for its easy setup and premium connection quality.
Confirm eSIM support and carrier-unlock status before departure.
Match your trip length and data usage to a fixed or unlimited plan.
Scan the QR code at home on Wi-Fi. The data plan hasn't started yet.
Turn the eSIM on in Settings after landing. You're online in seconds.
CDJapan Rental offers docomo-powered eSIMs for Japan — instant delivery, no queues.
Buy Japan eSIM →The QR code itself has no expiry date. Your plan's countdown only begins when you activate the eSIM in Japan — not when you scan the QR code.
No. Once installed, a CDJapan eSIM is tied to that specific device and cannot be moved or reinstalled on a different phone. If you need a new device, you'll need to purchase a new plan. Note that this is a CDJapan Rental policy — other providers may handle this differently.
Unfortunately, deleted CDJapan eSIMs cannot be reinstalled. Before deleting an eSIM, always contact support first. See our guide: Accidentally Deleted eSIM in Japan? Can It Be Reinstalled?
Your plan's days start counting from the moment you activate it. Activating before departure means you'll lose those days before you even land. We recommend installing (scanning the QR code) at home, but waiting to activate until after you arrive in Japan.
CDJapan travel eSIMs are data-only plans. Voice calls and SMS are not supported. For calls, use apps like WhatsApp, LINE, or FaceTime over your data connection. See our guide on using WhatsApp in Japan for more.
