eSIM for Peruvians Traveling to Japan — No roaming in Asia

In summary: To travel from Peru to Japan, an eSIM is the most practical way to have internet as soon as you land: you install it from Lima using Wi-Fi, activate it when you get off the plane, and avoid roaming from Claro, Movistar, Entel, or Bitel, which in Japan is expensive and often comes with reduced speeds. Your Peruvian number remains active for calls and texts.

If you've looked at your Peruvian operator's roaming rates for Japan, you already know why you're reading this. International roaming plans for Asia are usually expensive, with low data caps, and in many cases, speed is cut to 3G once you exceed a daily threshold. For a two or three-week trip—typical when crossing half the world from Lima—that combination can ruin your experience: maps that don't load on the Tokyo subway, photos that don't upload, and a constant feeling of rationing data.

The alternative that more and more Peruvians traveling to Japan are using is a local eSIM: a digital SIM that you install before leaving Peru and that gives you data at Japanese prices from the moment you land, without touching your physical SIM or losing your Lima number.

Why roaming from Peru to Japan is expensive

Peruvian operators—Claro, Movistar, Entel, and Bitel—have roaming agreements with Japanese networks, but Japan is not a "cheap" destination within their international roaming packages. Unlike neighboring destinations in South America, where some plans include regional roaming, Asia usually falls into the higher rate category. If you don't activate a specific package before traveling, out-of-plan consumption per MB can skyrocket your bill without you even realizing it until you return.

Even activating the "recommended" roaming package for Japan, there are three problems that are almost never explained in the fine print:

• Reduced speed: many roaming packages limit speed to 3G, or drastically reduce it after consuming a daily data cap.
• Advance activation: you have to contract it before leaving, and if the trip is extended or your plans change, you've already paid for days you won't use.
• Uneven coverage: in rural areas of Japan (mountains, towns in inland Kyoto or Hokkaido), international roaming sometimes loses signal before the country's local network.

To understand how data roaming works and why traditional roaming is structurally at a disadvantage compared to a local SIM, it's worth reading the technical difference before deciding.

What exactly is an eSIM and why is it useful in Japan?

An eSIM (embedded SIM) is an operator profile that is digitally installed on your phone, without a physical card. Instead of going to a store to get a chip, you receive a QR code by email, scan it from your phone settings, and the profile is downloaded. Your phone saves that profile along with your physical SIM from Peru, and you can activate one or the other (or both) as needed.

For a Peruvian traveler in Japan, this means one very specific thing: your Lima number stays active to receive calls and texts—for example, bank verification codes—while mobile data uses the Japanese eSIM. You don't have to choose between "having a Peruvian line" or "having internet in Japan": you have both at the same time, on the same phone.

If you want to compare the mechanism with traditional roaming in detail, here's an eSIM vs. roaming analysis that helps you decide based on your type of trip.

Is my Peruvian phone compatible with eSIM?

This is the first real hurdle many Peruvian travelers encounter, and it's often simpler than it seems. Most iPhones from XS onwards and mid-to-high-end Samsung, Google Pixel, and some Xiaomi/Motorola phones sold in Peru are compatible. The point that should be checked carefully is another: if you bought the phone from a Peruvian operator and it's still "partially unlocked" or has factory restrictions, sometimes the eSIM option appears blocked in the menu even if the hardware supports it.

Before buying any plan, check two things in your phone settings: that the "Add eSIM" or "Add data plan" option exists in the mobile network menu, and that the phone is carrier unlocked (not just paid off, but unlocked). If you have doubts, a quick trick: look in Settings → General → About/Information for the "EID" field. If a number appears there, your device supports eSIM.

How many GB does a Peruvian traveler need for Japan?

The amount of data depends on the type of trip, but there's a recurring pattern in almost all Lima-to-Japan itineraries: heavy use of Google Maps and public transport (trains, subway, buses), WhatsApp with family in Peru, social media, and some video calls. If you're moving between Tokyo, Kyoto, Osaka, and perhaps Hiroshima—the classic circuit—data consumption is higher in the first few days, when you still rely on the map for everything, and decreases as you become familiar with the routes.

As a rough guide to daily consumption in moderate use:

• Active navigation with Google Maps: the most consuming activity, especially on days with a lot of movement
• WhatsApp (messages, voice notes, photos with family): low-to-medium consumption
• Instagram and social media without playing much video: medium consumption
• Real-time translation with the camera (very useful for menus and signs in Japan): sporadic consumption, but can accumulate if used frequently

For a two-week trip to Japan with this usage profile, a mid-range plan usually covers more than enough; if you're going to work remotely, upload video frequently, or make long video calls, upgrade to the next tier. With PuraSim, you can top up data on the go if you run short, so there's no need to overbuy "just in case" on the first day.

If you're concerned about overspending, there are specific tricks that reduce consumption without sacrificing convenience—such as downloading an offline map of your neighborhood or disabling automatic app updates while traveling; these are explained in this guide to saving data while traveling.

How to install and activate your eSIM before flying from Lima

The advantage of doing it from Peru is that you have stable Wi-Fi at home and plenty of time to resolve any doubts before checking in. The process, step by step:

1. Buy the plan on purasim.com, choosing Japan as your destination and the GB size according to what we discussed above.
2. Receive the QR by email and install the profile from home, with Wi-Fi, a few days before your flight.
3. Set up the eSIM for data, not for calls or texts—those still come through your Peruvian line—and give it a recognizable name like "PuraSim Japan" to avoid confusion.
4. Leave it installed but inactive during the flight: the day counter doesn't start until you activate the data, so it's fine to have it ready in advance.
5. Activate it upon landing, whether at Narita, Haneda, or Kansai: go to Settings → Mobile Data and select the PuraSim eSIM as your data line.

If this is your first time installing an eSIM and you want to see the process with step-by-step screenshots, here's the complete eSIM installation guide.

Myths about eSIMs that many Peruvians still believe

There are several circulating ideas that deter people who would greatly benefit from this system:

"If my phone is from Bitel or Entel, it won't have an eSIM." The operator you bought the phone from doesn't determine if the hardware supports eSIM; what matters is the model and that it's unlocked. There are devices bought with any Peruvian operator that do support it, as long as they are unlocked.

"I'm going to lose my Peruvian WhatsApp number." No. WhatsApp is linked to your number, not to the physical SIM you use for data. With the eSIM active for data, WhatsApp continues to work with your Peruvian number without any extra steps.

"I need to activate my operator's roaming to receive bank codes." On the contrary: to receive SMS and calls from your Peruvian bank in Japan, it's enough for your physical SIM to have voice/SMS roaming activated (which is usually free or symbolic in cost for most operators) or simply to be switched on; you don't need the roaming data package for that. It's precisely that data package that you save with the eSIM.

"Buying the eSIM in Japan upon arrival is easier." It's possible, but it means relying on airport Wi-Fi just when you're most tired, and in busy airports like Narita, that public network gets saturated during peak flight hours. Installing it calmly from Lima avoids that initial hitch.

A fact almost no one uses to their advantage: in Japan, there are areas—especially old train stations and some temples on the outskirts of Kyoto—where even the local Japanese signal is weak underground or between stone buildings. Download offline maps of the cities you're going to visit as a backup, not as a substitute: the eSIM gives you a real connection, but an offline map saves you in a specific moment without coverage.

When you DON'T need an eSIM for this trip

Being honest here is as important to us as selling you a plan. If your trip to Japan is a short stopover of one or two days, you're staying in a hotel with decent Wi-Fi, and you don't plan to move much outside that area, the hotel's Wi-Fi and pre-downloaded maps will probably suffice. Nor does a large GB plan make sense for a business trip with fixed meetings and guaranteed office Wi-Fi: in that case, a small plan for a few days covers just enough for moving between meetings.

Where it does make a real difference is in classic tourism in Japan: several cities, long-distance trains, lots of walking around, and a constant need for maps, translators, and networks. That's where roaming impacts your bill and eSIM impacts your convenience.

Practical tips for travelers from Peru to Japan

• Notify your bank before leaving. It's common for Peruvian banks to block cards for "suspicious" movements in Japan if you don't notify them of your trip in advance. Do it through the app or by calling; don't leave it until the last day.
• Download offline content for the flight. The Lima-Japan route is usually long, with a layover, and Wi-Fi is not always available on board. Download maps, music, and series before leaving home.
• Be clear about how to call Peru without extra cost. With an active data eSIM, WhatsApp and video calls work just like at home: you don't need international minutes to talk to your family.
• Save your documents on your phone, offline. Passport, travel insurance, and scanned reservations saved locally, not just in your email: if you lose data at any point, they're still accessible.
• Take advantage of the Nikkei community if you need help. The historical connection between Peru and Japan—with relatively frequent flights from Lima and a consolidated Peruvian-Japanese community—makes it easier to find support or information in Spanish in cities like Tokyo or Nagoya than in other Asian destinations.
• If your route continues to South Korea, check before leaving whether a multi-destination plan might be better than buying two different eSIMs; we discuss this in the eSIM guide for Seoul and Busan.

One more note: Japan has fairly widespread public Wi-Fi in stations, konbinis (24-hour convenience stores), and shopping centers, but these open networks are not always secure for checking your Peruvian bank or logging into important accounts. With an active eSIM, you don't need to rely on them for essentials.

If your route isn't just Japan

Many Peruvian travelers combine Japan with South Korea or China in the same itinerary. If that's your case, check multi-country options beforehand: a single plan covering Japan and South Korea or, if you add China, one covering all three destinations together, might be better than buying a different eSIM for each leg of the trip.

Frequently asked questions

Written by Marc González Sáez Founder of PuraSim and a specialist in eSIM and connectivity for travelers. He has been helping people travel connected worldwide for years without overpaying for roaming, and personally tests eSIMs in each destination before recommending them.