TL;DR — Quick Answer
Roaming charges can turn a great trip into a painful phone bill. That’s why so many travelers now use a Ubigi eSIM instead. It lets you get online the moment you land — no SIM swapping, no hunting for a local shop, no surprise fees from your home carrier.
But a Ubigi eSIM only works smoothly if your device is ready for it and your settings are correct. This guide walks you through the whole thing in plain English: how to set it up, how to know if your phone is compatible, and how to fix the most common problems if something goes wrong.
What Is a Ubigi eSIM (and Why It Matters)
An eSIM is a digital SIM card built into your phone. Instead of pushing a tiny plastic card into a tray, you download a profile and your phone connects to a new network. Ubigi is one of these eSIM data services, and it’s run by Transatel, a Paris-based telecom company. That matters because Ubigi connects through real partner networks in each country rather than acting as a middleman, which usually means more stable coverage.
One handy detail: you only install Ubigi once. After that, the same eSIM stays on your phone for life. When you travel somewhere new, you just buy a fresh plan inside the app — no need to reinstall anything. Your modern phone can also hold several eSIM profiles at the same time and switch between them in Settings.
Step 1: Check Compatibility First
Before you buy anything, run two quick checks. One confirms your phone supports eSIM. The other confirms your phone is unlocked. Skipping these is the number-one reason people get stuck later.
Ubigi works with almost every recent eSIM device — iPhone, iPad, Android phones and tablets, plus LTE Windows 10 and 11 laptops. Here’s a quick view of where it stands:
| Device Type | Works With Ubigi? | Examples (2026) |
|---|---|---|
| iPhone | Yes — iPhone XS and newer | iPhone 17 / 17 Pro / Air, 16 series, 15 series, SE 3 |
| iPad | Yes — eSIM/Cellular models | iPad Pro, iPad Air, iPad mini (Wi-Fi + Cellular) |
| Android phones | Yes — most flagships | Pixel 10 / 9 series, Galaxy S25, Galaxy Z Fold/Flip, recent Honor & Asus ROG |
| Windows laptops | Yes — LTE/5G models | Surface, ThinkPad, Dell, HP with built-in cellular |
| Older / locked phones | No | Use a Transatel physical SIM instead |
If your device has no eSIM or is locked to your carrier, you can still get the same coverage and rates with a physical SIM from Transatel DataSIM, Ubigi’s sister brand. You can confirm any model on the official Ubigi compatible devices list.
Step 2: Set Up Your Ubigi eSIM
The whole process usually takes under five minutes. Do it at home before you travel, while you still have Wi-Fi. The plan won’t start until you reach your destination, so there’s no rush to use it.
Pick your destination in the Ubigi app or website and choose a data plan from the catalog. You’ll get a confirmation email with a QR code.
Scan the QR code with your camera, or press and hold it if it’s already on your screen. You can also install straight from the Ubigi app or your phone’s Add eSIM setting.
Sign up in the Ubigi app or at Ubigi.me. This lets you track data in real time, get usage alerts, and top up later without reinstalling.
Before you leave, switch off Data Roaming on your normal line. This stops your home carrier from charging you while you’re abroad.
When you land, turn on the Ubigi line and set it as the line for mobile data. The plan activates on first connection, and you’re online.
Carrier Compatibility: What You Really Need to Know
“Carrier compatibility” trips up a lot of first-time eSIM users, so let’s clear it up. There are two different ideas hiding in that phrase.
If your phone is tied to a carrier (common when you buy on a payment plan), it may refuse outside eSIMs. Run the unlock check from Step 1. If it’s locked, ask your carrier to unlock it before your trip — in the U.S., they’re generally required to once the device is paid off.
You don’t choose a “carrier” with Ubigi. When you arrive, it automatically connects to one of its local partner networks in that country. Because Transatel is an actual mobile operator, this is built in — you simply land and get signal. If it ever picks a weak network, you can do a manual network search and choose a different partner.
On Android and Windows, Ubigi needs Data Roaming switched on for its own line to work, because it rides partner networks abroad. As long as mobile data is applied to the Ubigi profile and not your home SIM, you won’t pay your home carrier anything. Only Ubigi’s flat rate applies.
Step 3: Troubleshooting Common Ubigi Problems
Most issues come down to a setting that’s slightly off. Work through these in order before contacting support — they fix the large majority of cases.
Open your cellular settings and check the Ubigi profile is listed and enabled. If you switched it off after install, turn it back on.
Make sure your phone is using Ubigi for mobile data, not your home SIM. This is the single most common fix.
If you have signal but no internet, the APN is usually the culprit. See the exact values in the table below.
Turn Airplane Mode on for 10 seconds, then off. If that fails, restart the device to refresh the connection.
If still no network, search for available networks and manually pick one of Ubigi’s local partners.
Ubigi APN Settings by Device
The APN normally sets itself when you install the eSIM. If it didn’t, enter it by hand using these values:
| Device | APN to enter | Where to find it |
|---|---|---|
| iPhone / iPad | mbb | Settings → Mobile Data → (Ubigi plan) → Mobile Data Network → type mbb in the APN fields |
| Android | mobiledata or mbb | Settings → Connections → Mobile networks → Access Point Names → select/add Ubigi |
| Windows 10 / 11 | mbb | Settings → Network & Internet → Cellular → Advanced / Mobile operator settings → Add APN |
Two quick extras: if you use a VPN, turn it off while connecting. And double-check you’re actually inside a country Ubigi covers. If everything looks right and it still fails, contact Ubigi support through the app — they often issue a fix or credit. Full steps live in the official Ubigi help center.
Need Help Getting Connected?
Visit Ubigi SupportSmart Tips for a Smooth Trip
No. Like every travel eSIM, Ubigi needs a carrier-unlocked phone. Check on iPhone under Settings → General → About → Carrier Lock; you want “No SIM restrictions.” If your phone is locked, ask your carrier to unlock it (usually free once the device is paid off) before your trip.
It starts when you arrive at your destination and the eSIM connects to a local network for the first time — not when you buy it. That’s why you can safely set everything up days before you travel without losing any data.
This is almost always an APN problem. Set the APN to mbb on iPhone and Windows, or mobiledata on Android. Also confirm that mobile data is applied to the Ubigi line and not your home SIM, then toggle Airplane Mode off and on to refresh.
On Android and Windows, yes — turn Data Roaming on for the Ubigi line specifically. Ubigi uses partner networks abroad, so roaming has to be enabled for it to work. As long as mobile data is set to Ubigi and not your home SIM, you won’t be charged by your home carrier.
Yes. Your normal SIM stays in your phone, so calls and texts to your usual number keep working. Ubigi only handles mobile data. Just keep data roaming off on your home line so it doesn’t rack up charges.
Yes, most plans let you share your Ubigi data as a personal hotspot, which is handy for connecting a laptop or tablet. On iPhone, make sure the Personal Hotspot APN field also contains mbb if tethering doesn’t connect right away.
No. You install the Ubigi eSIM once and keep it forever. For each new trip, just open the app and buy a plan for that destination. You can even do this offline. There’s no need to scan a new QR code every time.
Ubigi works with most eSIM-capable devices: iPhone XS and newer, recent iPads, Pixel and Galaxy flagships, many other Android phones and tablets, and LTE/5G Windows 10 and 11 laptops. You can confirm your exact model on the official Apple eSIM support page or Ubigi’s device list.
