What is an eSIM and how does it differ from your usual SIM?
An eSIM is a SIM card that, instead of coming in plastic and being inserted into a slot, is installed as a digital profile inside your cell phone. Getting one means buying that profile online and downloading it with Wi-Fi; there's no chip to wait for by mail or to look for at a counter.
For those who have never used one, this often sounds more complicated than it is. In practice, getting an eSIM is more like buying a movie ticket than dealing with your operator: you pay online, receive a code in the form of a QR or an installation link, and your phone does the rest. You don't need to change your number or touch your main line, because most recent cell phones support two active lines at once: your usual physical SIM (for calls and messages from your country) and the new eSIM (only for data, while you travel).
The reason why more and more travelers choose it instead of looking for a physical chip upon arrival is simple: you get and install it before boarding the plane, so you land with working data instead of queuing at the airport with your luggage. You can read a more in-depth explanation of how this technology works in what is an eSIM.
Where can I get an eSIM?
There are three main ways: the website of a specialized eSIM provider for travelers, your own operator's app or store (if it offers eSIM and international roaming), or the local operator of the country you're traveling to, if it sells eSIMs in addition to physical chips. The difference between them lies in when you can activate it, how long the purchase takes, and whether you need to be in your destination to get it.
A specialized provider is usually the simplest option for someone who travels to several countries or doesn't want to rely on finding local coverage upon landing: you choose the destination, pay, and the profile arrives in your email or directly to your cell phone in minutes. This is where a collection of eSIM plans by destination comes in, with coverage for more than 200 destinations, where you can compare and choose the country or region before leaving home.
Your own operator, on the other hand, may offer international roaming without you having to contract anything separately, but it usually costs more per gigabyte and the conditions vary from one operator to another, so it's a good idea to check them in advance if that's your option.
How to get an eSIM chip step by step?
The process is practically the same no matter which provider you choose, and it doesn't take more than a few minutes once you know what to expect:
- Confirm that your phone is compatible. Most mid-range and high-end models from recent years are, but it's a good idea to check before paying.
- Choose the destination or coverage you need. It can be a single country, a region, or several destinations if your trip includes more than one stop.
- Select the data plan based on how many days you'll be away and how much you typically use your phone (there's a guide below to help you calculate it).
- Pay online. The process is the same as any online purchase.
- Receive the installation profile, usually a QR code or a link, by email or within the app itself; with providers like PuraSIM, this usually takes about a minute from payment confirmation.
- Install the eSIM with Wi-Fi, before leaving home if you wish, even if data consumption hasn't started yet.
- Activate it upon arrival at your destination, when you want the plan time to start counting.
That last step—install before, activate later—is the part most people skip and the one that prevents the most headaches. We explain it in more detail in how to activate an eSIM.
How can I get an eSIM right away, without planning ahead?
If you are already at the airport, in a taxi to the flight, or even after landing, you can still get an eSIM as long as you have Wi-Fi available somewhere: the waiting room, the hotel, or a public network. The only real requirement is not time, but a connection to download the profile.
It's worth noting a practical difference here: once you land, you probably won't have Wi-Fi until you reach the hotel, and your normal line's mobile data may be deactivated or incur roaming charges. Therefore, getting and downloading the eSIM before takeoff—even if you activate it hours later, once you've arrived—is the way to avoid relying on finding Wi-Fi precisely when you need it most.
"The biggest mistake I see is not getting it late, it's installing it late. The purchase can be made from the plane seat if there's Wi-Fi on board, but installing the profile without connection, once landed, is where people get stuck."
Where can I get my eSIM and what should I check before paying?
Before paying for any plan, there are three things worth confirming, in this order:
- That your phone accepts eSIM. Not all models do, and some that do come locked by the original carrier, which can prevent installing profiles from other providers. You can check your model in eSIM compatible phones.
- That the plan covers the exact country or region of your trip, and not just "international coverage" generically: some regional plans exclude specific countries.
- How much time you have to activate it after purchase. This matters more than it seems if you buy weeks in advance: if the plan requires activation within a few days of purchase, you run the risk of it expiring before your flight.
This last point is something almost no one checks until it happens to them. It's a practical advantage to buy with a margin: at PuraSIM, for example, the eSIM can be activated up to 180 days after purchase, so you can take advantage of an offer months in advance and install it on your phone at home—only with Wi-Fi, without spending plan data yet—and keep it ready for the day of the flight without the clock starting to run prematurely.
Airport, local operator or online: comparison
Each channel has a different logic depending on how much time you have and how much you want to sort out before traveling.
| Channel | When you get it | What you need to check | Best for |
|---|---|---|---|
| Local operator upon arrival (physical SIM) | At destination, with your phone already out of data | Language, required documentation, store hours | Long trips with a single fixed base |
| Data counter at the airport | Upon landing, before leaving the terminal | Queues, price usually higher than online | Someone who arrived without a plan and needs data now |
| Online eSIM provider | Before leaving home, with Wi-Fi | Phone compatibility, exact destination coverage | Planned trips and multiple destinations |
| Roaming from your home operator | Activates automatically when crossing the border | Cost per gigabyte, countries included | Short trips where you prioritize not changing anything |
How much data do you need for your trip?
Calculating the correct data plan prevents two common mistakes: overpaying for an oversized plan, or running out of data halfway through your trip. As a guide, here's how typical usage patterns behave:
| Type of trip | Typical duration | Approximate data usage | What to avoid |
|---|---|---|---|
| Weekend getaway | 2-4 days | Maps, messaging, and social media without heavy video | Underestimating GPS if you're driving |
| One-week trip | 5-8 days | Photos, occasional video, Wi-Fi calls when possible | Long video calls with mobile data |
| Long trip or remote work | 2 weeks or more | Email, work video calls, moderate streaming | Buying a short plan "just in case" and running out of coverage |
| Roadtrip with constant navigation | Variable | GPS in the background consumes more than people think | Leaving navigation with low-quality data in rural areas |
A concrete example helps make this less abstract: someone traveling to Seoul for ten days for tourism, using maps all day, uploading photos and videos to social media at night from the hotel with Wi-Fi, usually fits into the "one-week trip" category in the table, even if they stay an extra couple of days. The key is not to hit the exact gigabyte, but not to run short on the last two days of the trip, which is when the phone is used most for coordinating the return.
eSIM, physical SIM or roaming: which is best for you?
There's no single answer, but there are questions that quickly resolve it. If your phone is compatible and you'll be in more than one country, the eSIM usually wins because you can change plans without changing chips. If your phone is old or locked, a local physical SIM may be your only real option. And if your trip is so short that it's not worth installing anything new, your operator's roaming—even if it's more expensive per gigabyte—saves you the step of setting something up.
The full comparison, with advantages and limitations of each option, is in eSIM vs. roaming and in eSIM vs. physical SIM, if you want to delve deeper into your particular case before deciding.
Common mistakes when getting an eSIM
Most problems don't come from the technology itself, but from details overlooked at the time of purchase:
- Buying without checking phone compatibility, and only discovering it when trying to install the profile.
- Confusing "install" with "activate", and installing the profile at the airport without Wi-Fi available.
- Choosing a country-specific plan when the trip crosses several borders, and running out of coverage when changing destinations.
- Not noting where the QR code was saved after installation, in case it needs to be reinstalled on another phone.
- Assuming "unlimited" means without any limits, when there is almost always a fair use policy behind that word.
If something doesn't work as expected once you're at your destination, it's a good idea to first check your phone settings before assuming the problem is with the plan: the common eSIM problems guide covers the most frequent causes and how to resolve them without relying on finding Wi-Fi to ask for help.
Frequently asked questions
Do I need Wi-Fi to get and activate an eSIM?
To get and install it, yes, you need Wi-Fi or data, because the profile is downloaded over the internet. To activate it, however, some providers allow you to do so with mobile data once you land, although the simplest way is still to install with Wi-Fi before the flight and activate later.
Can I get an eSIM if my phone is locked by an operator?
It depends on the type of lock. A phone locked to a specific operator may reject eSIM profiles from other providers, so it's best to confirm with your home operator before buying, not after.
What happens if I buy an eSIM and end up not traveling?
As long as you don't activate it, the installed profile does not start consuming data or counting the days of the plan. That's why it's a good idea to buy with a margin and activate only when the trip is confirmed.
Can I use an eSIM and my physical SIM at the same time?
Yes, on phones with dual lines you can keep your physical SIM active for calls and messages from your country, and use the eSIM only for data abroad. It's the combination most travelers use to avoid changing numbers.
Can I get an eSIM for several countries on the same trip?
Yes, there are regional plans that cover several countries with the same profile, useful if your itinerary crosses borders. It's advisable to check the exact list of included countries before purchasing, as not all regional plans cover the same destinations.
What do I do if my eSIM stops working during my trip?
Before assuming the plan failed, check that mobile data for that line is activated and that data roaming is turned on for that specific eSIM, as many phones disable it per line independently. If the problem persists, a reputable provider should give you a contact method that works outside your local time zone: at PuraSIM, for example, email and WhatsApp support is available 24/7 in several languages.
Do I need to uninstall the eSIM at the end of my trip?
It's not mandatory, although many users prefer to remove it upon return to avoid accumulating inactive profiles on their phone. The plan simply stops having available data once the time or contracted gigabytes are used up.
In summary: how to choose
Getting an eSIM comes down to three decisions: confirming your phone supports it, choosing a plan that truly covers your route, and separating the installation time from the activation time so you don't depend on finding Wi-Fi at the worst possible moment. If you travel to several countries, change destinations frequently, or simply want to sort out your data before boarding the plane, it's the option that adds the least friction to your trip.
If you want to see available coverage by destination and compare plans before deciding, the international eSIM collection is the most direct starting point.
