Ubigi review 2026: how good is this eSIM really? (our honest test)

Before judging an eSIM, you might as well know who makes it. Ubigi is the consumer brand of Transatel, a French telecom operator founded in 2000, which originally specialized in wholesale connectivity. The Ubigi brand itself was launched in 2018.

The detail that changes everything: Transatel was acquired in 2019 by NTT, the Japanese telecom giant, which also owns NTT Docomo, the country's number one mobile operator. Being part of an operator of this size is a real guarantee of reliability, which is rare in the eSIM world where many players remain fragile. This provider was also awarded the best MVNO operator prize in 2023.

But this legacy has a direct impact on their offerings. Ubigi wasn't originally designed for tourists: their historical core business is industrial connectivity and IoT. Because of this, Ubigi comes pre-installed on Windows laptops (Lenovo, Microsoft Surface) and is embedded in connected cars from brands like BMW, Fiat, or Toyota. The general public is an extension of this base, not the original target. You can really feel it when using it. Let's take a closer look at how it performs in terms of plans, network, and customer reviews.

The principle is the same as any travel eSIM: you buy a data plan online, you install a profile on your phone, and you access the internet via a local partner network, without changing your SIM card. This technology avoids roaming fees abroad, the ones your usual operator charges. You keep your primary SIM card active in parallel for your French line.

Two useful features. First, Ubigi uses a single reusable eSIM profile: no need to reinstall an eSIM for every country, you just activate a new plan on your existing eSIM. Second, tethering is allowed on high-data plans, which isn't always the case elsewhere.

Quick reminder: like any travel eSIM, Ubigi provides data, not a phone number. To make calls or send messages, you can use WhatsApp, iMessage, or Telegram. And before you buy anything, make sure your phone is compatible with eSIM technology.

Ubigi offers three types of plans: one-time (a fixed amount of data, ideal for a trip), monthly (a rechargeable subscription that renews automatically), and annual. Prices are set in GB, with no hidden speed throttling, which works in favor of transparency.

Here are some real prices found on the Ubigi website for Japan, in June 2026:

Entry-level offers start around 4 $ (500 MB) or 8 $ (3 GB) depending on the destination. For small data volumes and entry-level plans, Ubigi is often a bit more expensive than the most aggressive price players, like Airalo. You're paying for reliability and NTT infrastructure, not the rock-bottom price. If budget is your priority, check out our full Airalo review before deciding.

Good to know about monthly plans: data capacity and payments renew automatically every month. It's practical for those traveling continuously, but something to keep an eye on if you only need internet for a single trip. Ubigi also offers unlimited plans by duration for certain destinations. Note: this provider doesn't aim for the most competitive pricing, but rather for stability.

How to subscribe to an Ubigi plan: user guide

Signing up for a Ubigi plan is pretty easy. You pick your plan based on duration and data volume, validate the purchase via the mobile app or the website, and your offer is valid as soon as it's activated. Ubigi also highlights a free 500 MB offer to test the service, and regularly offers a promo code for your first order. Each plan option clearly displays its validity period, and you can contact support if you have any doubts before buying your data plan.

That's Ubigi's strong suit. The brand claims global coverage in nearly 200 countries, with local, regional, and international plans. Depending on your destination, you'll connect via 3G, 4G, or 5G through high-quality partner networks. European coverage is particularly solid, which makes sense given Transatel's Parisian roots.

Whether you're traveling in Europe, Asia, America, or the Middle East, Ubigi covers a huge part of the world with tailored regional or international offers. This wide range of destinations explains why this provider is so popular with globetrotters.

Ubigi also offers a rare feature: a virtual IP address that lets you choose the IP of your home country, which is useful for keeping access to certain online services as if you were at home.

In practice, the amount of data you need depends on your trip. For browsing, messaging, and a bit of online maps, 5 to 10 GB is often enough for two weeks abroad. If you're watching videos or working remotely, aim for more. Ubigi offers a wide range of data volumes, from small backup plans to heavy-duty options for long stays. Before buying, estimate your actual needs: it prevents you from paying for data you'll never use.

Just a heads-up: signal quality isn't the same everywhere. Some feedback mentions unstable connections in certain areas, and the coverage list isn't always up to date. The smart move: check that coverage is actually available in your country before you buy, to avoid any nasty surprises once you arrive.

In terms of ratings, Ubigi holds its own. The brand shows about 4.1/5 on Trustpilot (based on tens of thousands of reviews), 4.6/5 on the App Store, and 4.0/5 on Google Play. The reviews are consistent across platforms, which makes the rating credible. Positive comments generally praise the simplicity, while criticisms point to service responsiveness and, sometimes, connection speed. Ubigi's reputation remains generally solid.

The everyday user experience

In real life, the Ubigi experience is solid when everything goes well: you install the profile, you arrive at your destination, and mobile internet access happens all by itself. You can track your usage through the app, and topping up is available at any time, even without Wi-Fi. Where it gets complicated is if a problem arises: the service takes time to react, and you often have to go through the website rather than the app. To compare this profile to a direct competitor, we've detailed everything in our Holafly vs Ubigi comparison.

Reliability in Japan: generally good, sometimes inconsistent

Japan is one of the most in-demand eSIM destinations in the world, so the question of reliability deserves a real answer. Good news: the vast majority of travelers describe a fast and stable connection, powered by the NTT Docomo and KDDI networks, even in big cities and along train lines.

But the experience isn't 100% perfect. Some users report the opposite in certain areas: full 5G bars showing with no actual internet access, pages that won't load, and support that's slow to react when something goes wrong. The honest truth: Ubigi's reliability in Japan is generally good, but it remains a bit inconsistent from one user to another. If you're heading to an area where you can't afford to lose connection (Suica payments, subway maps), keep a backup solution handy.

What we love

• ✅ Ultra-reliable infrastructure, powered by the NTT group.
• ✅ Stable and regular connection, especially in Europe and Asia.
• ✅ A single eSIM profile reusable across multiple countries.
• ✅ Tethering is allowed on data-heavy plans.
• ✅ Virtual IP address and compatibility with Windows PCs.
• ✅ Simplified top-ups and usage tracking directly from the app.
• ✅ Wide compatibility: smartphones, tablets, and PCs.
• ✅ Billing in euros, practical for European customers.

The downside

• ❌ Above-average prices in classic tourist destinations.
• ❌ Aging interface, designed more for businesses than for the general public.
• ❌ Slow customer service, without reliable live chat anywhere.
• ❌ Tricky automatic renewals on certain plans.
• ❌ Restrictive refund policy.

Is Ubigi suitable for Japan?

Coverage in Japan is pretty good: the Ubigi network relies on the major local operators (NTT Docomo, KDDI), and many travelers describe a fast and stable connection. As mentioned above, the experience can still be uneven depending on the area. For critical needs (Suica payments, maps in the subway), keep a backup solution or choose an eSIM with proven stability in Japan.

There are no wrong answers here, just different profiles.

Choose Ubigi if...

• You travel for several weeks a month and want a rechargeable monthly data subscription.
• You have professional use or you manage a fleet of phones for a company.
• You need connectivity on a Windows computer or a virtual IP address.

Choose voilà if...

• You're going on a leisure trip and you want the most data for your budget.
• You want zero hassle: no subscriptions, no surprise renewals, and no hidden fees.
• You care about human support and an eSIM that's easy to use every day.

Ubigi is a serious and robust eSIM that deserves its reputation thanks to the NTT infrastructure. For a frequent traveler, business activity, or the need for connectivity on a laptop and in a car, it's a solid and reliable option.

But for the vast majority of trips, the math is simple: voilà is cheaper, simpler, and just as reliable, with human support and no-trap plans. You get the same network quality without paying the pro price. Compare the plans, check your device's compatibility, and choose the offer that truly fits your trip. Ready to travel connected without breaking the bank? It's up to you.