You land, switch off airplane mode, and either your phone just works or a text arrives telling you roaming now costs $12 a day. A travel eSIM is how most people avoid the second outcome in 2027. This guide explains how it works, what it really costs next to roaming and local SIM cards, and how to set one up in about two minutes before you fly.
An eSIM for international travel is a digital SIM you download to your phone that gives you local mobile data abroad, without swapping your physical SIM. You buy a plan online, scan a QR code at home on Wi-Fi, and your phone connects to a partner network when you land. Your normal number stays on for calls and texts. For a one-week trip, a travel eSIM usually costs a fraction of a carrier roaming pass.
- How it works
- eSIM vs roaming vs local SIM
- What it costs
- Which plan to buy
- How much data
- Setup checklist
- Keep your number
- FAQs
What is an eSIM for international travel?
Every phone needs a SIM profile to join a mobile network. With a physical SIM, that profile lives on a small plastic card. With an eSIM, it lives on a chip already built into your phone, and you download new profiles over the internet.
A travel eSIM is a prepaid data plan for another country or region that you add as a second line. Your home SIM stays where it is. You simply tell your phone to use the travel eSIM for mobile data while you are away.
Most phones can store several eSIM profiles at once, so you can keep a Europe eSIM, a USA eSIM and your home line on the same handset and switch between them in Settings.
How a travel eSIM works, step by step
That's the whole process. Once you land, the eSIM connects to a partner network in that country, the same way a local SIM would. On ETravelSim plans that start on first use, such as the Europe eSIM, the validity period only begins when the eSIM first connects in your destination. Installing a few days early costs you nothing.
eSIM vs roaming vs a local SIM card
You have three realistic ways to get mobile data abroad. Here is how they compare for a typical one-week trip.
| Travel eSIM | Carrier roaming pass | Local SIM card | |
|---|---|---|---|
| Typical cost for 7 days | Often under $25 for a week or more | $84 on a $12/day US pass; about £18 on a £2.59/day UK pass | Cheap per GB, plus airport mark-ups |
| Setup | QR code at home, 2 minutes | Automatic | Queue on arrival, passport check, SIM swap |
| Keeps your number on | Yes, on any eSIM phone | Yes | Only on dual-SIM phones |
| Online when you land | Yes | Yes | No, not until you buy one |
| Multi-country trips | One regional plan covers them | Yes, but the daily fee keeps running | New SIM in each country |
| Best for | Most trips from 3 days to a month | One-day stopovers | Long stays in one country |
Day-pass prices from AT&T, Verizon and UK network roaming pages, checked October 2026. Your own plan may differ.
What does an international eSIM actually cost?
The main US carriers price roaming by the day. AT&T's International Day Pass is $12 a day on land, plus $6 for each extra line, and it stops charging after 10 days per bill period. Verizon's TravelPass is also $12 a day, with 5 GB of high-speed data per day.
In the UK, several networks have brought back daily fees for Europe since Brexit. EE charges about £2.59 a day, Vodafone £2.57 and Three £2.00, and countries outside Europe usually cost £5 to £7.50 a day.
A travel eSIM sells data, not days. A September 2026 analysis by Axis Intelligence found that a standard seven-day, 3 GB trip costs 9.6 times more on a US carrier day pass than on a published travel eSIM plan. Here is what that looks like with real prices.
Data for a European trip: roaming pass vs travel eSIM (USD)
Sources: AT&T International Day Pass terms; ETravelSim Europe eSIM price on etravelsim.com, 7 October 2026.
The gap grows on longer trips and for couples, because roaming charges you per line, per day. One eSIM plan with hotspot support can also share data with a partner's phone or a laptop.
Where roaming still makes sense: a single-day stopover, or if your home plan already includes the country for free. Some UK plans, such as O2's, still include EU roaming within a fair-use limit. Check yours before you buy anything.
Which ETravelSim plan fits your trip?
Pick the plan type by where you are going and how you use your phone. All plans are prepaid, delivered instantly by email, and need no documents.
Destination eSIM
- Best value for single-country trips
- USA from $3.50, UK from $4.00, Japan and Turkey from $4.50
- Hotspot on supported plans
Regional eSIM
- Europe: 35 countries on one plan, including the UK, Switzerland and Turkey
- Asia from $10.99, North America from $4.99
- No new SIM at each border
Truly Unlimited Data
- No data caps and no speed throttling
- Hotspot and tethering on most plans
- Europe, USA, Turkey, Japan, Dubai, Thailand and more
Global Flex 365
- One eSIM for multi-region itineraries
- Built for long stays, frequent travellers and digital nomads
- No need to buy a new eSIM for every country
Starting prices checked on etravelsim.com on 7 October 2026 and may change.
Standard unlimited vs Truly Unlimited: ETravelSim's standard unlimited plans give you 4 GB a day at full 4G/LTE speed, then unlimited data at 1 Mbps for the rest of the day, resetting every 24 hours. Hotspot is not available on those plans. The Truly Unlimited range has no daily cap and no throttling. If you plan to stream, run video calls or share data with a laptop, choose Truly Unlimited or a large fixed-data plan.
How much data do you need abroad?
Most travellers overestimate. Use this as a rough guide and add a buffer for long travel days.
| How you use your phone | Rough daily use | For 7 days | Plan to pick |
|---|---|---|---|
| Light: maps, messaging, email, bookings | 300 to 500 MB | 3 to 5 GB | 5 GB fixed-data plan |
| Moderate: plus social media, photo uploads, some video | 1 to 1.5 GB | 10 GB | 10 to 25 GB plan |
| Heavy: video calls, streaming, remote work | 2 GB or more | 15 GB or more | Unlimited or Truly Unlimited |
| Sharing: hotspot for a partner or laptop | Double your own use | 20 GB or more | Large fixed-data or Truly Unlimited |
Estimates only. Video quality and app settings change usage a lot. Turning off auto-play and cloud photo backup on mobile data saves the most.
Setup checklist: before you fly and when you land
At home, on Wi-Fi
- Check your phone is unlocked and supports eSIM: dial *#06# and look for an EID number
- Buy your plan and open the QR code email
- iPhone: Settings > Mobile Service > Add eSIM, then scan the code
- Android: Settings > Connections > SIM Manager > Add eSIM
- Rename the new line "Travel" so you can tell the two apart
- Download offline maps for your first city, just in case
When you land
- Turn the travel eSIM line on
- Set it as your mobile data line
- Switch data roaming ON for the eSIM
- Keep your home line on for calls and texts, with its data roaming OFF
- No signal after a few minutes? Restart the phone and check data roaming again
Your QR email also includes manual activation details (an SM-DP+ address and activation code), in case the camera scan fails. For screenshots of each step, see our guides to installing an eSIM on iPhone and installing an eSIM on Android.
Can you keep your phone number with a travel eSIM?
Data roaming OFF
Data roaming ON
Yes. This is the main reason travellers like eSIMs. Modern phones run two lines at once: your home SIM and the travel eSIM.
Leave your home line switched on for calls and texts, with data roaming turned off so it cannot use any data. Set the travel eSIM as your mobile data line. You stay reachable on your normal number, and one-time passcodes from your bank still arrive by text.
WhatsApp, iMessage and FaceTime keep working on your usual number too, because they run over the eSIM's data.
Receiving texts while abroad is usually free on home plans, but making calls on your home line can still be charged as roaming. Check your carrier's rates, or call over WhatsApp or FaceTime instead.
Will a travel eSIM work on your phone?
Your phone needs two things: eSIM support and no carrier lock. Most phones from the last few years qualify.
- iPhone: every model from the iPhone XR and XS onwards, including the iPhone 17 range, iPhone 18 Pro and iPhone Duo
- Google Pixel: Pixel 3 and newer, with a few early regional exceptions
- Samsung Galaxy: S20 and newer, Note20 and the Z Fold and Flip series on most models
- Others: many recent Motorola, OnePlus, Xiaomi, Honor and Oppo models, depending on region
New iPhone owners, take note: the iPhone 18 Pro and 18 Pro Max are eSIM-only in the US, Canada, Japan, Mexico and the Gulf states, and the foldable iPhone Duo is eSIM-only worldwide. If you have one of these, you can't buy a physical SIM at the airport at all. A travel eSIM is the simplest way to get local data.
Not sure about your model? Use our device compatibility checker before you buy.
5 mistakes that stop a travel eSIM from working
- Leaving data roaming off on the eSIM line. Travel eSIMs connect to partner networks, so your phone treats them as roaming. Data roaming must be ON for the eSIM, even though you are not paying roaming fees.
- Deleting the eSIM by accident. Many QR codes can only be installed once. Keep the eSIM installed until the trip is over, and contact support if you remove it by mistake.
- Using a carrier-locked phone. A locked phone may hide the "Add eSIM" option. Ask your carrier to unlock it well before you travel.
- Forgetting to switch the data line. If mobile data still points at your home SIM, you will roam on your home plan. Check Settings > Mobile Data after you land.
- Choosing standard unlimited for a hotspot. Standard unlimited plans are for one device. Pick a fixed-data or Truly Unlimited plan if you need to share.
Why travellers choose ETravelSim
- Validity starts on arrival on plans like the Europe eSIM, so you can install early with no risk
- Multi-network coverage in each country, so your phone picks the strongest available signal
- Calls when you need them: selected Europe plans include 100 local minutes and a real UK (+44) number
- Top up any time from the website or the ETravelSim app, without installing a new eSIM
Get online the moment you land
Choose your destination, get your QR code by email, and install it before you leave home. Plans from $3.50.
Browse eSIM plansFirst order in the app? Use code APP10 for 10% off.
eSIM for international travel: FAQs
Do I need an eSIM for international travel?
You don't need one, but it is usually the cheapest and easiest way to get data abroad. Without one, you either pay your carrier's roaming fee, often $12 a day in the US, or queue for a local SIM after you land.
What is the best eSIM for international travel?
It depends on your route. For one country, a destination eSIM is usually cheapest. For several countries, a regional plan such as the ETravelSim Europe eSIM covers 35 countries on one plan. For long or multi-region trips, a global plan like Global Flex 365 saves buying a new eSIM each time.
When should I install my travel eSIM?
Install it at home on Wi-Fi a day or two before you fly. Installation needs an internet connection, and on ETravelSim plans that start on first use, the validity period does not begin until the eSIM connects in your destination.
Can I keep my phone number while using a travel eSIM?
Yes. Keep your home SIM switched on for calls and texts with its data roaming off, and set the travel eSIM as your mobile data line. You stay reachable on your normal number and still receive bank codes by text.
Can I make calls with a travel eSIM?
Most travel eSIMs are data-only, so you call over WhatsApp, FaceTime or similar apps. Selected ETravelSim Europe plans include 100 local minutes and a UK (+44) number with free incoming calls.
Can I use a hotspot with a travel eSIM?
Yes on ETravelSim fixed-data plans and on most Truly Unlimited plans. Hotspot is not available on the standard unlimited plans, which are for a single device.
Is unlimited data really unlimited?
On ETravelSim's standard unlimited plans you get 4 GB a day at full 4G/LTE speed, then unlimited data at 1 Mbps until the allowance resets 24 hours later. The Truly Unlimited range has no daily cap and no speed throttling.
How do I know if my phone supports eSIM?
Dial *#06#. If you see an EID number, your phone supports eSIM. It must also be carrier-unlocked. Every iPhone from the XR and XS onwards, Google Pixel 3 and newer, and Samsung Galaxy S20 and newer support eSIM on most models.
What should I do if my eSIM doesn't connect?
Check that the eSIM line is turned on, set as your mobile data line, and has data roaming switched on. Then restart your phone. If it still doesn't connect, ETravelSim support is available 24/7 by chat, WhatsApp and email.
Keep planning your trip
- International Roaming Plans & Data: Costs, Tips & Best Options
- Guide to Activating Your eSIM with a QR Code
- Best Places to Visit This Winter 2026–27
- Best eSIM for Turkey: Network Comparison & Plans
- Europe eSIM: 35 countries including the UK and Switzerland
- USA eSIM: 5G data from $3.50
Last updated: 7 October 2026. Roaming prices come from carrier pages and published reporting, and ETravelSim prices were checked on etravelsim.com on 7 October 2026. Prices and plans can change, so check before you buy.