How to Buy an eSIM for Japan?
To buy an eSIM for Japan, check that your phone is unlocked and eSIM-compatible, choose a provider and plan, then install the eSIM over Wi-Fi before departure. After landing, turn on the eSIM, set it as your data line, and enable data roaming. Most tourist eSIMs are data-only.
To buy eSIM for Japan, you need a few things sorted before you fly. Your phone has to support eSIM and be fully unlocked; the network your provider connects to affects how well it performs once you're outside Tokyo or Osaka; and most plans are data-only, so a phone number isn't part of the deal unless you go looking for one specifically.
Knowing how to buy eSIM for Japan really comes down to sequencing, checking your phone first, picking a provider second, and activating only after you've landed.
Getting this order right is what actually determines whether the eSIM works the moment you land, not just remembering to switch on data roaming.
Step 1: Check Device Compatibility
Your phone needs native eSIM support, generally an iPhone XR/XS or newer, a Google Pixel 4 or newer, or a Samsung Galaxy S20 or newer, and it has to be fully carrier-unlocked.
Before buying anything, check if your iPhone is unlocked or unlock Android phone in your cellular settings, since a locked phone will reject the eSIM profile regardless of provider.
Step 2: Choose a Provider and Plan
Airalo runs primarily on SoftBank, with fixed-data plans from 1GB up to 20GB alongside unlimited options, though coverage can thin out once you leave major cities. Ubigi runs on a similar network mix and is known for stable speeds, with data packages that scale by duration.
Airalo, Ubigi, and Jetpac cover most of what people search for when figuring out how to buy an eSIM for Japan.
Jetpac's Japan eSIM connects to KDDI and Rakuten Mobile, with plans starting around $4 and popular 7-day packs running $7 to $15. WhatsApp keeps working even after your data pack runs out, and hotspot sharing has no data cap.
If you specifically need a Japanese phone number rather than just data, Mobal is worth looking at separately, since most other providers, Jetpac included, are data-only.
Step 3: Buy and Install Before You Fly
Pick your plan on the provider's app or website and complete checkout. You'll get a QR code by email along with setup instructions.
Go to your phone's cellular settings, add the Japan eSIM, and scan the code while you're still on stable Wi-Fi at home, ideally the day before or the morning of your flight rather than at the airport.
Step 4: Activate When You Land
Once you're in Japan, go back into cellular settings, turn the new eSIM line on, set it as your primary line for data, and switch on data roaming for that specific profile.
It can take a couple of minutes to connect to a network after this step, so don't assume something's wrong if it's not instant.
A Few Things Worth Knowing First
Most tourist eSIMs, Jetpac included, are data-only, so calls and texts run through apps like WhatsApp, FaceTime, or LINE instead of a traditional phone number. Your home SIM can stay active alongside the Japan eSIM if you want to keep receiving texts or two-factor codes, while all your data routes through the Japan line.
Knowing how to buy an eSIM for Japan properly, meaning before you fly rather than after you land, is really the one step that determines whether the rest of the trip goes smoothly.
Disclaimer
This blog is for educational purposes only. All information is based on publicly available data and product details that can change over time. Always confirm current pricing, network coverage, and device compatibility before traveling, since offerings can shift. Jetpac is not responsible for any inaccuracies, changes, or losses arising from reliance on this information.
