What do I need to do to get internet abroad?
To have internet abroad, your cell phone needs to connect to a mobile data network in the country you are in. The three most common ways are to activate your home operator's roaming, buy a physical SIM upon arrival, or install an eSIM before you leave. Each option changes the price and effort required.
The confusion often starts because none of the three options are well explained when you need them: at the airport, suitcase in hand and your cell phone at 1% battery. Let's clarify it calmly, section by section, so that when you buy your ticket, you'll know exactly what to do with your connection.
As a general rule: if you're going to be connected for more than a couple of days and want to avoid surprises, the simplest option nowadays is an eSIM that you install before traveling. But to understand why, it's worth looking at all the alternatives first.
How can I use the internet abroad?
You have four possible paths, and they are not mutually exclusive: you can combine more than one on the same trip.
International roaming. Your local operator allows you to use your same number and plan outside your country, usually for an extra daily or package charge. The advantage is that you don't change your number or touch anything on your phone. The disadvantage is that the cost can skyrocket if you don't check the conditions before leaving, and many operators in Mexico, Colombia, Argentina, Chile, or Peru do not include all destinations equally.
Local physical SIM. You buy a SIM card upon arrival (at the airport, in a store, or at a street vendor) and physically insert it into your phone. It is usually inexpensive, but it involves queuing, sometimes showing your passport, waiting for activation, and being without your usual number while using the new line.
eSIM. This is a digital SIM that is installed via software, without a physical card. You buy and activate it before you travel, and many phones allow you to have your home physical SIM and the destination eSIM working simultaneously (one for calls and SMS, the other for data).
Public or hotel Wi-Fi. Free, but only works where there is a network available: it doesn't work on the street, on public transport, or when you need it most, such as when looking for an address or ordering a car.
How to make your data work in another country?
Technically, your phone needs authorization from a local network (or a roaming agreement with your home operator) to transmit data. Without that authorization, you see the signal but cannot browse. This is what confuses many people: having "coverage" on the screen is not the same as having data enabled.
With roaming, authorization is managed by your own operator through agreements with foreign networks; that's why it sometimes takes time to activate as soon as you land. With a physical SIM or an eSIM, authorization comes directly from an operator in the country you visit (or from a provider that groups several countries), so it usually activates as soon as the plane lands and the phone searches for a network.
One point that almost no one checks before traveling: frequency bands. Not all phones support the same 4G/5G bands in all countries. Before buying any solution, it's worth confirming your device's compatibility, especially if it's an older model or bought unlocked in another market.
The network does not distinguish if you activated roaming, inserted a new SIM, or installed an eSIM: it only verifies if you have authorization to transmit data at that moment. Everything else you decided before boarding the plane.
How can I get internet on international trips?
If your trip crosses a single country, any of the above options work well. The problem arises when the itinerary includes two, three, or more countries on the same trip, which is very common on routes in Europe, Southeast Asia, or when making long layovers.
With roaming, each country can have different conditions within the same plan, and it's easy to lose track of how much you've spent. With a physical SIM, you would have to buy (and waste time looking for) a new card at each border. With an eSIM that covers several destinations, changing countries doesn't require any paperwork: the phone connects to the available network automatically in each place.
For international multi-country trips, the most practical approach is to plan your connection just as you plan your itinerary: check which destinations your chosen option covers, how many travel days you have in total, and whether you need data every day or only for certain segments.
A real travel example: 14 days between Thailand and Vietnam
Imagine you leave Mexico City for Bangkok, stay six days in Thailand, cross to Hanoi, and end up in Ho Chi Minh before returning. That's two countries, fourteen days, and you need internet from the moment you land to order a car to the hotel.
Before leaving home, with Wi-Fi available, you install the eSIM on your phone: the process involves scanning a QR code or following a link, and it takes a couple of minutes (it helps to review how to install an eSIM step by step beforehand, so you don't have to improvise at the airport). You leave it installed but without activating the data plan yet, so your home operator doesn't charge you roaming while you fly.
As soon as you land in Bangkok, you activate the eSIM from your phone's settings. In minutes, you have data to order your transport and locate your hotel. When you cross into Vietnam days later, you don't do anything special: if your eSIM covers both countries, the phone automatically searches for the available network. Meanwhile, your physical line from Mexico remains active to receive important calls or messages, because the phone keeps both SIMs working in parallel.
This same scheme applies to almost any multi-country route: the key is to install everything before leaving, not after landing.
Roaming, physical SIM, or eSIM: a direct comparison
Each option has a use case where it excels. Here's a comparison of what really matters when deciding (you can see the full details in eSIM vs. roaming and eSIM vs. physical SIM).
| Option | What you need to do | When it's convenient | Its weak point |
|---|---|---|---|
| Operator roaming | Nothing, activate or confirm it before leaving | Very short trips where you prioritize zero friction | Different conditions per country and easy to lose track of spending |
| Local physical SIM | Buy it and swap it upon arrival, keep yours safe | Long stays in a single country, tight budget | You lose your number while using it; process in each new country |
| eSIM | Install it before leaving, activate upon landing | Single or multi-country trips, you want to keep your number | Requires an eSIM-compatible phone |
| Public Wi-Fi | Search for an available network in each location | Complement at hotel or Airbnb, never as the only option | Doesn't exist on the street, public transport, or rural areas |
What is an eSIM and why is it becoming more common?
An eSIM (digital SIM, already thoroughly explained in what is an eSIM) is a chip integrated into the phone itself that is programmed by software instead of being inserted as a physical card. In practice, for you as a traveler, it means you buy the data plan online, install it with a code, and never touch the phone's SIM tray.
Most mid-range and high-end phones from recent years are compatible, but not all, and some unlocked models bought in certain markets have the function blocked. Before buying any eSIM, confirm that your device supports it by checking the list of eSIM-compatible phones.
The reason for its growth is simple: it solves the central problem of traveling, which is not having to rely on finding a physical store, queuing, or risking losing your tiny regular SIM while using the destination's SIM.
How much internet do you need according to your trip type?
Not all trips consume data equally. Before choosing a plan, find your profile in this table so you don't overpay or run out of data mid-trip.
| Travel profile | Typical data usage | What to look for in your plan |
|---|---|---|
| Short business trip (3-5 days) | Email, maps, WhatsApp calls | A plan for a few days, without committing to more time than you need |
| Vacation (1-2 weeks) | Maps all day, social media, photos uploaded on the go | A multi-day or weekly plan, with room for days of higher usage |
| Multi-country trip (backpacking) | Constant usage for transport, accommodation, and translation | Coverage that includes all countries on your route in a single plan |
| Remote work from abroad | Video calls, email, and browsing several hours a day | Higher data volume and, if you travel frequently, an easy-to-renew option |
What mistakes leave you without internet mid-trip?
Most connection problems abroad are not the fault of the network, but something that was left pending before leaving. These are the most common:
Leaving installation for the destination airport. Installing an eSIM requires an internet connection, so if you wait until you arrive and there's no Wi-Fi available at that moment, you won't be able to install it. Do it from home, calmly, and activate it only upon landing.
Not checking phone compatibility. Buying any solution without first confirming if your device supports it is the most frequent cause of being without service on the first day.
Not verifying the activation window for what you bought. If you buy in advance, confirm how many days you have from the purchase to activate it; buying too far in advance is useless if the deadline has already passed when you arrive at your destination.
If something doesn't work as expected during your trip, there is almost always an identifiable cause and a quick solution: you can check the list of common eSIM problems before assuming the plan doesn't work.
Frequently asked questions
Do I need to activate my operator's roaming if I already have a data eSIM?
Not for browsing: the eSIM gives you data on its own. Many people keep their usual line's voice and SMS roaming off or in its basic mode, and use the eSIM only for internet, thus avoiding data charges from their home operator.
Can I have internet abroad without changing my cell phone number?
Yes. If your phone supports two active lines (one physical and one eSIM, or two eSIMs), your usual number will continue to receive calls and messages while you use the other line only for data.
What if my phone is not eSIM compatible?
Then your practical options are your operator's roaming or a local physical SIM. It's worth confirming compatibility before traveling, as it varies quite a bit between brands and years of manufacture.
How long before the trip should I install my eSIM?
You can install it as soon as you buy it, even weeks in advance, as long as you have Wi-Fi available at that moment. Installation and activation are separate steps: you install whenever you want, activate it when you arrive at your destination.
Does internet abroad work the same for calls and WhatsApp?
WhatsApp and other messaging apps use data, not the traditional voice network, so they work with any of the options as long as you have active data. Regular calls from your usual number depend on whether you keep that number active with voice roaming.
What do I do if I run out of data mid-trip?
It depends on the provider: some allow you to buy an additional plan or recharge from the same app or panel where you bought the first one, without needing a physical store.
Is hotel or Airbnb Wi-Fi enough for the entire trip?
Only if you never leave that place. As soon as you need maps, a car, or to translate something on the street, fixed Wi-Fi is no longer useful, which is why it's convenient to have it as a complement and not as your only plan.
Can I use internet in several countries with the same plan?
Yes, if you choose a plan designed to cover several destinations at once, which is increasingly common with eSIMs aimed at travelers crossing borders on the same itinerary.
Conclusion: what to do before your next trip
Having internet abroad doesn't depend on the luck of the airport you land in, but on a decision you can make calmly before leaving home: choosing between roaming, a physical SIM, or an eSIM based on the duration and number of countries on your route, and installing everything in advance.
For most trips today, especially if you visit more than one country or want to keep your usual number, an eSIM solves the problem with less friction than other options. If you've never used one, the ultimate guide to eSIM for travel is a good next step to understand the rest of the details.
If you already know where you're traveling, you can directly check the available plans by destination in the international eSIM collection, with coverage in over 200 destinations, activation in approximately one minute, and 180 days from purchase to activate it when you need it. Support, if you have questions during the process, is available via email and WhatsApp 24 hours a day, in several languages.
