You land in Tokyo, step off the plane, and your phone connects before you've reached passport control. No SIM swap, no airport kiosk, no €12 roaming charge for checking a map. That's the promise of a travel eSIM — and Ubigi is one of the most interesting names doing it in 2026.
Unlike the consumer-first marketplaces that dominate the space, Ubigi comes from a telecoms background: it's a brand of Transatel, owned by NTT (one of the world's largest network operators). That heritage is the whole story here — it shapes what Ubigi is brilliant at, and where it falls a little short. Here's our honest take.
What is an eSIM (and why use one)?
An eSIM is a digital SIM card built into your phone. Instead of slotting in a plastic chip, you download a data plan and a QR code installs it in seconds. You keep your home SIM (and your normal number) active for calls and texts, while the eSIM handles cheap local data abroad.
The advantages for travellers are simple but real:
- Connected on arrival — install before you fly, activate when you land
- No roaming bill shock — you pay a fixed price up front
- Keep your number — dual-SIM means your home line stays reachable
- No physical SIM to lose — it all lives in your phone
First, make sure your handset supports eSIM (dial *#06# — if you see an EID number, you're good). Our device compatibility guide covers every major brand.
Ubigi eSIM review: who are they?
Ubigi launched in 2017 and is operated by Transatel, an NTT company and one of Europe's largest MVNO enablers — the kind of business that powers connectivity for other brands behind the scenes. Ubigi is its consumer-facing travel eSIM.
That B2B DNA matters. Transatel has deep network agreements worldwide, and Ubigi is even pre-installed on many Windows laptops (Lenovo, HP, ASUS) and built into connected cars from BMW, Toyota and others. For travellers, it translates into enterprise-grade reliability — and genuinely excellent performance in markets where Ubigi rides premium local networks.
Coverage and speed
Ubigi covers 200+ destinations worldwide, with 4G/5G data and 5G now live in 65+ locations. Where it really shines for our readers is Japan and South Korea: thanks to NTT's home-market strength and premium network partners, Ubigi consistently posts some of the fastest, most stable speeds you'll get on any travel eSIM in those countries. It's a strong all-rounder elsewhere in Asia too.
Ubigi in Asia: the plan structure
One thing to understand before you buy: Ubigi does not sell a single regional "unlimited Asia" plan. Instead you choose from:
- Country plans — e.g. dedicated Japan, Thailand, Singapore or South Korea data
- Large regional packs — such as a "Best Asia" 60GB / 30-day bundle for multi-country trips
- Unlimited in 50+ individual destinations — including some Asian markets like Thailand, Singapore and India (bought per-country, not as one regional plan)
- Recurring plans — monthly/yearly options for frequent travellers, plus pay-as-you-go top-ups
Ubigi pricing
Pricing is flexible and starts low — from around $2.90 for small short-trip bundles, scaling up to large multi-gig and unlimited packages. Data allowances run from 500MB single-day options all the way to unlimited. You only pay once for a one-off plan, and when the data runs out you simply top up in the app.
| At a glance | Ubigi |
|---|---|
| Operator | Transatel (an NTT company), est. 2017 |
| Coverage | 200+ destinations · 5G in 65+ |
| Asia standout | Japan & South Korea (premium networks) |
| Plan types | Country, regional, global · one-off & recurring |
| Data range | 500MB → unlimited (per-country) |
| From | ~$2.90 |
| Hotspot | Supported (can be inconsistent for some users) |
| Calls / SMS | No — data only |
| Setup | App or QR code · under a minute |
Ubigi pros and cons
Pros
- NTT/Transatel network heritage — enterprise-grade reliability
- Outstanding speeds in Japan & South Korea
- 200+ destinations, 5G in 65+
- Very fast setup — install in under a minute
- Flexible plans: one-off, recurring, pay-as-you-go top-ups
- Works on laptops/tablets too (pre-installed on many Windows PCs)
Cons
- No single regional "unlimited Asia" plan
- Data-only — no calls, SMS or phone number
- Hotspot/tethering can be hit-or-miss for some users
- Pricier than the budget marketplaces
- The app feels a little dated
- Customer support can be slow to respond
How to set up the Ubigi eSIM
Setup is one of Ubigi's strengths — it's genuinely quick. Do it at home on Wi-Fi before you travel.
- Download the Ubigi app (or go to the website) and create an account
- Choose your destination and a data plan, and pay
- Install the eSIM profile — tap the QR code in the confirmation email, or let the app install it directly (manual entry is also available)
- In your phone, label the line something like "Ubigi Data"
- Set your home SIM for calls/texts and the Ubigi eSIM as your data line
- Turn on Data Roaming for the Ubigi line, and switch it on when you land
Who is Ubigi best for?
- Japan & South Korea travellers — the network quality is the best reason to choose Ubigi
- Frequent flyers — recurring monthly/yearly plans and easy top-ups suit regular trips
- Laptop & tablet users — rare among travel eSIMs, and a real bonus for remote workers
- Reliability-first travellers — if you value a rock-solid connection over the absolute lowest price
It's a weaker fit if you specifically need cheap unlimited regional data, reliable hotspot tethering, or a local phone number — in those cases see how it stacks up in our full provider comparison.
Ubigi won't be the cheapest option in every market, and it's data-only with no regional unlimited plan — but the NTT/Transatel network heritage delivers a level of speed and stability that budget rivals can't always match, particularly across East Asia. Add fast setup and laptop support, and it's an easy recommendation for travellers who want connectivity that just works.
Get a Ubigi eSIM →
