What Is an eSIM? A Simple Guide for Travelers (2026)

An eSIM (embedded SIM) is a SIM card that is built into your phone. Instead of pushing a tiny piece of plastic into a tray, you download a digital profile from a mobile carrier, usually by scanning a QR code or tapping a button in an app. Technically it does exactly the same job as a physical SIM: it identifies you on the network so you can make calls and use mobile data.

For travelers, eSIMs have changed the game. You can buy a data plan for your destination from home, install it before you fly and be online the moment you land. No hunting for a SIM kiosk at the airport, no passport copies, no paperclip to open the SIM tray.

How does an eSIM work?

Your phone contains a small chip called an eUICC. It can store several carrier profiles at once, often eight or more depending on the model. Most phones can use two of them at the same time, for example your regular phone number and a travel data plan. Every eSIM-capable device has a unique identifier called the EID, which is used to assign a profile to your specific phone.

When you buy a travel eSIM, you receive an activation code. Your phone uses it to contact the provider's server, downloads the profile and saves it on the chip. The eSIM then shows up in your settings like a second SIM card, and you decide which line handles mobile data, calls and texts.

Travel eSIM vs. the eSIM from your carrier

Many carriers, including AT&T, Verizon, T-Mobile, EE or Vodafone, already put your regular number on an eSIM. That is convenient, but it does not change what your carrier charges for roaming. Travel eSIMs from providers such as Airalo, Holafly or Saily are prepaid data plans for a specific country or region. They use partner networks on the ground and are often much cheaper than your carrier's international day pass.

Why use an eSIM when you travel?

Online as soon as you land: install the eSIM on Wi-Fi at home and simply switch on data after arrival.
No surprise bills: prepaid means full cost control. When your data runs out, nothing extra is charged; you just top up if you need more.
Keep your own number: thanks to dual SIM, your home number still receives calls, texts and bank verification codes while the travel eSIM handles data.
No card swapping: your physical SIM stays in the phone, so there is nothing to lose.
Easy to compare: pick the country, validity and data amount that fit your trip. That is exactly what comparison sites like Simhop are for.
One plan for several countries: a regional eSIM for Europe or Asia covers you across borders on multi-country trips.

Downsides and limits

eSIMs are handy, but there are a few things to know before you buy:

Compatibility: not every phone supports eSIM, and the phone must be carrier-unlocked. Our list of eSIM compatible phones helps you check.
Usually data only: most travel eSIMs do not include a phone number. Calls work through WhatsApp, FaceTime or similar apps.
Profiles are not freely transferable: once deleted, an eSIM profile often cannot be reinstalled. Only remove a travel eSIM after the plan has expired.
You need internet to install it: the download requires a connection, ideally Wi-Fi before you leave.

How much does a travel eSIM cost?

Prices depend mainly on the destination, validity and amount of data. In countries with lots of competition and inexpensive networks, such as Turkey or Thailand, small plans cost just a few euros. In markets with high wholesale prices, such as the USA or parts of Africa, you pay noticeably more per gigabyte. Unlimited plans cost more but save you from counting megabytes. Current prices are listed on every destination page; we update them regularly, but they can change at any time.

How to use a travel eSIM in four steps

Check compatibility: does your phone support eSIM and is it unlocked?
Choose a plan: set your destination, trip length and data needs. Not sure how much you need? Read How much data do I need?
Install it: ideally one or two days before departure, on Wi-Fi. Our step-by-step guides cover iPhone and Android.
Activate on arrival: after landing, select the travel eSIM for mobile data and turn on data roaming for that line. Done.

Country, regional or global eSIM?

Travel eSIMs come in three flavors. Which one suits you depends on your route:

Country eSIM

Works in one country only and is usually the cheapest option there. Ideal for a classic single-destination trip, like two weeks in Japan or a beach vacation in Turkey. Country eSIMs often use the best or two best local networks.

Regional eSIM

Covers several countries in one region, for example Europe, Asia or North America. Great for multi-country trips, layovers or flexible itineraries. Double-check that every country on your route is included; non-EU countries such as Switzerland, the UK or the Western Balkans are sometimes missing from Europe plans.

Global eSIM

A global eSIM works in more than a hundred countries. It costs more per gigabyte but is practical for round-the-world travelers, frequent flyers and business travelers with changing destinations.

What makes a good eSIM plan?

Price matters, but it is not everything. When comparing, also look at:

Local network: which carriers does the plan use? In large countries this decides whether you have signal outside the cities.
Speed: 4G/LTE is standard almost everywhere, and more providers now offer 5G.
When validity starts: does the clock start at installation or at your first connection in the destination?
Hotspot: can you share data with a laptop or travel companions?
Top-ups: can you add data without installing a new eSIM?
Throttling: unlimited plans often slow down after a certain amount of data per day.

Is an eSIM cheaper than roaming?

It depends on your carrier and where you go. Within the EU, European plans roam at domestic rates. US carriers typically charge a daily fee for international use, and UK carriers have brought back daily charges for Europe on many plans. In most of those cases, a travel eSIM is the cheaper way to stay connected, especially on longer trips. We break it down in eSIM vs. roaming.

FAQ

Is an eSIM more secure than a physical SIM?

In one respect, yes: an eSIM cannot simply be pulled out of a stolen phone, so the device stays trackable for longer. Otherwise the level of security is comparable.

Can I use an eSIM and a physical SIM at the same time?

Yes. Almost every eSIM-capable phone supports dual SIM. Your home number stays active for calls and texts while the travel eSIM provides mobile data.

Does a travel eSIM come with a phone number?

Usually not. Most travel eSIMs are data-only. Calls and messages run through apps like WhatsApp, Signal or FaceTime. A few providers offer plans that include a number.

When should I install my travel eSIM?

One or two days before departure, on Wi-Fi at home. With most providers the plan only starts once the eSIM connects to a network in your destination, but check the plan details to be sure.

Does an eSIM work in a tablet or smartwatch?

Many cellular iPads and Android tablets support travel eSIMs. Smartwatches usually rely on an eSIM tied to your carrier plan and generally cannot use travel data plans.