eSIM – What on Earth is That?
You know the feeling? You've just landed after a long flight at your dream destination, you want to quickly open Google Maps – and then it hits you: no signal, no SIM card in sight, and somewhere deep in your travel bag, a tiny plastic card is waiting to never be found again. Welcome to the past.
The eSIM – short for embedded SIM – is the digital answer to exactly this problem. No inserting, no searching, no "Oh no, my SIM card just fell on the platform"-moment. Your mobile profile is simply loaded digitally onto your phone – and you're instantly connected, wherever in the world you happen to be.
In this article, I'll explain how the eSIM works, what its pros and cons are – and why it's a total gamechanger for travellers.
How Does the eSIM Actually Work?
Think of the eSIM as a tiny, built-in chip inside your phone – smaller than your little fingernail, soldered directly onto the main circuit board of your device. This chip can store and manage digital SIM profiles. That means: instead of inserting a physical card, you simply download a so-called eSIM profile – usually via a QR code that you receive from your provider.
Here's how it works: you book an eSIM online, receive a QR code by email, scan it with your smartphone – and that's it. Your phone automatically connects to the relevant mobile network, without you having to open a single box or hunt for a needle to open the SIM tray.
The great thing about it: you can store multiple eSIM profiles on your device at the same time and switch between them as needed. When travelling, this means you can keep your home number while simultaneously activating a local data eSIM for your destination country. Two numbers, one phone – no second device needed.
Advantages of the eSIM – Why Travellers Love It
Okay, the technical part is sorted. But what does this actually mean for you as a traveller? Quite a lot, as it turns out.
1. Connected Instantly – Right at the Airport
In the old days, the routine after landing was a little adventure in itself: find the airport SIM stand, queue up, try to explain which plan you want through hand gestures, insert the card, and pray it works. With a travel eSIM, all of that is a thing of the past. You can buy and install your eSIM before you even board the plane – it then activates automatically once you land in your destination country. While others are still standing at the SIM stand, you're already in a taxi with your hotel address typed into Google Maps.
2. No More Bill Shock
We've all been there: you come back from holiday, open your phone bill – and suddenly wish you'd just stayed abroad permanently. Roaming charges can be astronomically high depending on your destination, especially outside the EU. A local travel eSIM connects directly to a local provider's network and is typically a fraction of the price you'd pay for international roaming. Your wallet will thank you.
3. Pure Flexibility
Planning a road trip through multiple countries? No problem. For many travel regions, there are eSIMs that work across several countries at once – for example, a single eSIM for all of Southeast Asia or all of Europe. Alternatively, you can load a separate eSIM for each country and simply switch between them. This kind of flexibility simply wasn't possible with physical SIM cards.
4. Your Home Number Stays Reachable
Thanks to the Dual-SIM function – the ability to have two SIM profiles active at the same time – you can keep using your regular phone number while browsing the internet abroad with a local eSIM. Important calls or texts from home won't go missed, while you're still using data at a fraction of the usual cost.
5. Nothing Physical to Lose
Finding a tiny SIM card in an overstuffed backpack is practically an art form. The eSIM can neither be lost nor stolen – it sits firmly inside your device. And if your profile is accidentally deleted, it can usually be reactivated with ease.
Disadvantages of the eSIM – For the Sake of Honesty
As practical as the eSIM is – it wouldn't be fair not to mention the downsides too. No technology is perfect, and the same goes here.
Not All Devices Support eSIM
The eSIM is on the rise, but it's far from available on every smartphone. Older models often don't support it yet. To check whether your device is eSIM-compatible, simply type the code *#06# into your phone's dialler. If an EID number appears, your device supports eSIM.
Some Countries Have Restrictions
In certain countries, such as China, there are restrictions on the use of foreign eSIMs or specific data services. It's worth doing a quick check before your trip to see whether there are any special regulations at your destination.
You Can't Transfer an eSIM When Switching Phones
If you change your smartphone, you can't simply take the eSIM out like a physical card and pop it into your new device. You'll need to request the profile from your provider again and set it up on the new phone. It's not a big deal, but it does take a moment more effort than the classic SIM swap.
Who Benefits Most from a Travel eSIM?
In short: almost anyone who travels regularly. But there are a few groups for whom the travel eSIM is an especially obvious win:
Frequent Travellers and Digital Nomads – If you spend several months a year on the road, or even work from different countries, you'll benefit enormously from the flexibility of the eSIM. No more SIM card chaos, no juggling different plastic cards – everything runs digitally and smoothly.
Weekend Travellers – Even if you're just heading to Lisbon for a weekend or Thailand for a week, you don't want to spend time fussing over a SIM card when you arrive. With a pre-installed eSIM, your trip starts relaxed – from the very first moment.
Backpackers on Multi-Country Tours – If you're travelling through five countries in three weeks, you don't want to deal with mobile data issues in every single one. Regional eSIMs that work across multiple countries simultaneously are the perfect solution here.
Business Travellers – Time is money, and if you're on a business trip, you don't want to waste precious minutes at an airport SIM stand. A pre-installed eSIM means: phone on, signal ready, time to prepare for the meeting.
How to Set Up a Travel eSIM – Step by Step
The process is genuinely straightforward. Here's a quick overview:
- Check whether your phone supports eSIM – via the code *#06# or in your device settings under "SIM card" or "Mobile data".
- Choose your plan – think about how much data you need and which countries you'll be visiting.
- Buy your eSIM online – after purchasing, you'll receive a QR code by email.
- Scan the QR code – go into your phone's settings, select "Add eSIM" and hold your camera over the QR code.
- Activation – most travel eSIMs activate automatically once you arrive in your destination country.
That's it. No tools, no queues, no stress.
Final Thoughts: The eSIM is the Best Travel Companion You've Never Packed
The eSIM is no longer a vision of the future – it's very much the present, and it makes travelling a whole lot easier, cheaper and less stressful. Say goodbye to SIM card chaos, bill shock, and that nagging feeling that you've misplaced a tiny piece of plastic somewhere.
Your next trip is just around the corner? Then don't wait until you've landed. Grab your Horisim travel eSIM now, set it up in two minutes – and start your adventure connected from the very first moment.