eSIM for travel: how it works, how to set it up, and what it costs
If you've been told to "just get an eSIM" before your next trip, this page explains what that actually means, what happens on your phone, and how to avoid the two mistakes that cause almost every roaming bill.
What is an eSIM?
An eSIM is a SIM card built into your phone that can be programmed by software. Instead of collecting a plastic card at the airport, you download a profile — a travel data plan for the country you're visiting — and your phone treats it as an extra line. Everything a physical SIM does, it does, without the tray, the paperclip or the tiny card you inevitably lose.
How an eSIM works when you travel abroad
A travel eSIM buys capacity on local networks in your destination. When you land, the profile registers on one of those networks the same way a local pay-as-you-go SIM would, so you get local speeds at local prices. Your home SIM stays in the phone and stays quiet: calls, texts and verification codes still arrive, but with roaming switched off for that line, your home carrier can't charge you for data.
Travel eSIM plans are data-only. That's not a limitation for most travellers — WhatsApp, FaceTime, Telegram and Zoom all run over data, and your normal number keeps working for anything that needs it.
Setting one up in four steps
1. Check your phone
Dial *#06#. If an EID number appears and your phone is carrier-unlocked, you're ready.
2. Choose a plan for your dates
Pick the country or region you're visiting, then the amount of data that matches your trip length.
3. Install on Wi-Fi before you fly
Scan the QR code from your confirmation email and name the line 'Travel'. It stays dormant until you arrive.
4. Switch it on when you land
Make the travel line your data line, turn data roaming on for that line — and leave it off for your home line.
How much data do you actually need?
Maps, messaging and the occasional ride-hailing app use roughly 300–500 MB a day. Add social video and you're closer to 1–1.5 GB a day. If you plan to hotspot a laptop for work, budget 2 GB a day. A one-week city break is comfortable on 5 GB; a month of remote work is usually 20 GB or more.
eSIM versus roaming versus a local SIM
Roaming is the most expensive option and the easiest to trigger by accident. A local SIM is cheap but costs you an hour at arrivals, an ID check and a swapped-out home SIM. A travel eSIM sits in between on price and wins on effort: you're connected before you reach passport control, and there's nothing to return.
Common questions
Ready to buy an eSIM for your trip?
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