Ubigi eSIM review: the Transatel model explained

Ubigi is one of the most recognizable names in travel eSIM, partly because it comes from a mobile connectivity company rather than a pure app startup. If you are searching "ubigi esim", you probably want to know how the model works before you buy.

This page is a model comparison, not a lab test. We explain how per-GB eSIMs like Ubigi are structured, where they shine, and how a truly unlimited plan like VoaSim compares. No invented prices, no fake ratings — check Ubigi's current rates in its own app.

What Ubigi is and how the model works

Ubigi is operated by Transatel, part of NTT Group — a connectivity company with roots in machine-to-machine and carrier services, not only tourist data. That background is why Ubigi is often pre-installed or listed in the eSIM menus of some laptops, tablets and connected cars.

The commercial model is straightforward and familiar: you choose a destination or region, pick a data bundle measured in gigabytes, and pick a validity window. You install the eSIM profile, land, connect, and the app tracks how much data you have left. When the bundle runs out, you top up inside the app.

Everything is managed from the Ubigi app or website — plan purchase, top-up and usage monitoring. For the current catalog, countries covered and exact pricing, go to the official Ubigi site or app. Rates and bundle sizes change often, and we will not quote numbers that could be outdated by the time you read this.

Per-GB vs truly unlimited: the real decision

The core question is not which brand has the nicer app. It is whether you want to count gigabytes or stop counting.

Per-GB eSIMs like Ubigi reward light, predictable use. If you travel with hotel Wi-Fi, use offline maps and mostly need messaging plus the occasional ride-hailing app, a small bundle can be very cheap.

The model gets uncomfortable when your usage is unpredictable: video calls home, uploading photos and video, streaming on a long train ride, tethering a laptop, or a family all leaning on one connection. Then you either buy a big bundle upfront or top up mid-trip, sometimes at an airport gate with 4% battery.

VoaSim removes that variable. Truly unlimited data: no cap, no speed throttling, no hidden "fair use" clause that slows you down after a certain point. You buy days, not gigabytes. See the full logic on our best eSIM guide.

VoaSim pricing: one price per duration, every destination

VoaSim charges by trip length, not by country. A week in Japan costs the same as a week in Portugal or Brazil. Today's prices include a 15% promo:

Trips of 1 to 4 days pay the 5-day package. Maximum 90 days per eSIM. A second eSIM in the same order gets 10% extra off — useful for couples. Payment is in USD by international credit or debit card through Stripe, with no hidden fees and an invoice by email. Get your exact number in the price simulator.

Coverage, devices and what VoaSim does not do

VoaSim covers 170 destinations on every continent, connecting automatically to local networks on 4G and, where available, 5G. The Europe plan covers 50 countries with a single eSIM, including Switzerland, the UK, Turkey, Norway and Iceland.

Honest limits, stated upfront:

• No island Caribbean right now — Dominican Republic, Cuba, Jamaica, Bahamas, Aruba, Curaçao. Puerto Rico works on US networks.
• Data only. No phone number, no traditional voice calls. WhatsApp, app calls and maps work over data; your own number stays active on your physical SIM.
• Cruises: works on land in ports, not at sea.
• Hotspot: do not assume it. It depends on the plan — ask support before you rely on it.

Compatibility: iPhone XR or newer, Galaxy S20 or newer, Pixel 3 or newer, and most phones from 2020 on. Dial *#06# — if an EID appears, your phone supports eSIM. Carrier-locked phones must be unlocked first.

When Ubigi is the better pick

We would rather you buy the right thing than the wrong thing from us.

Choose Ubigi (or another per-GB brand such as Airalo, Nomad or Saily) when:

• You need data on a laptop, tablet or car where Ubigi is already integrated into the device's eSIM menu.
• Your trip is short and your usage is genuinely tiny — a couple of gigabytes is enough and cheaper.
• You want a single app that stores many destinations and top-ups over years of travel.
• You are heading somewhere VoaSim does not cover yet, like the island Caribbean.

Choose VoaSim when data anxiety is the problem you are solving: long trips, heavy map and video use, remote work, or a multi-country route where one eSIM should just keep working. Compare it against carrier roaming too — day passes can make sense for very short hops.

Buying and installing without drama

After checkout, the QR code arrives by email within minutes, with a WhatsApp heads-up if you left a number. There is a step-by-step guide for iPhone and Android.

Two rules that prevent almost every problem:

1. Install before you fly, while you still have home Wi-Fi.
2. Keep the eSIM line off until you land. Your days start counting at the first connection to a network at the destination. On Android, do not switch on the eSIM's data before the trip.

Then turn off data roaming on your home carrier so you are not billed twice. Your physical SIM and number keep working, so WhatsApp stays on your usual number.

If anything goes wrong, support is human — chat on site or hola@voasim.com. There is also a free eSIM Rescue tool that diagnoses an eSIM of any brand with no signal, Ubigi included. And if the eSIM will not connect and support cannot fix it, you get a 100% refund. More on how we operate: trust page.

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