What is a local SIM?
A local SIM is a card from a carrier in the country you are visiting, purchased there to have a number, data, and sometimes minutes from that country during your trip. It helps you avoid paying your home carrier's roaming prices, but it involves finding, buying, and physically changing it in your cell phone.
It's the "traditional" solution for travelers who want cheap data at their destination: you arrive, go to a phone counter at the airport or downtown, buy a card with a data plan, and the salesperson (or you yourself) installs it in your phone. For decades, it was the only real alternative to expensive roaming, and in many countries, it's still a valid option.
The problem isn't that it doesn't work well: it's that it depends on finding the right point of sale, having identification handy (several countries require a passport to register the line), waiting in line, and your cell phone supporting that network's band. If you travel to several countries on the same itinerary, the process repeats at each border.
This is where the local eSIM comes in: it solves the same problem — affordable data in the country you're in — but without the physical card or the search for a counter. The rest of this article explains exactly how.
What is an eSIM and how does it differ from a local SIM?
An eSIM (embedded SIM) is a chip that is already soldered inside your cell phone from the factory. Instead of inserting a physical card, you install a digital profile —basically a connection data package— that tells that chip which network to connect to. Almost all mid-range and high-end cell phones since 2019-2020 have this technology, although many users have never used it.
The difference with the plastic local SIM is not in what it does (both give you a data line from an operator in a country or region), but in how it gets to your cell phone. The physical SIM is purchased in person and inserted into the tray. The eSIM is purchased online, installed by scanning a QR code or with a link, and is active without touching the phone's hardware.
When we talk about "local eSIM," we refer to an eSIM profile designed to work in a specific country or region, just like the physical local SIM, but delivered digitally. You can consult the complete comparison in our guide on what an eSIM is if you want to delve deeper into the technology itself.
A local eSIM is nothing more than a digital profile that tells your cell phone: "here, in this country, use this network." There is no plastic to insert or envelope to lose in the bottom of your backpack.
How does a local SIM's eSIM work?
The technical process has three steps, although for you as a user, they feel like one. First, you buy the data plan for the country or region you are going to visit. Second, your cell phone downloads the eSIM profile —a small file with the network configuration— usually by scanning a QR code or touching an automatic installation button. Third, when you land and activate mobile data, the cell phone searches for the local network of the operator associated with that profile and connects, exactly as a physical card would.
The key difference from traditional roaming is that your cell phone is not using your home operator "on loan" at roaming prices: it is connected directly as a data customer of the local operator (or a wholesale agreement with them), which is why the prices are more similar to a local plan than to a roaming bill.
An important detail that almost no one explains well: most modern cell phones allow you to have two active profiles at once —your usual physical line, with your number and WhatsApp, and the local eSIM with travel data— and choose which one uses mobile data. This way, you continue to receive calls and messages on your usual number while browsing with the data line of the country you are in, without changing cards or losing your number.
Local physical SIM vs. local eSIM: a complete comparison
The table summarizes the practical differences between buying a physical SIM upon arrival at the destination and activating a local eSIM before or during the trip.
| Aspect | Local Physical SIM | Local eSIM |
|---|---|---|
| Where to get it | At a counter, store, or vending machine at the destination | Online, before or after landing |
| What you need to bring | Identification (passport in many countries), sometimes local cash | Just your cell phone with an internet connection to install the profile |
| Card change | Yes: you remove your usual SIM and store it somewhere | No: your physical line stays in the cell phone |
| Time until you have data | Depends on the queue and operator registration | Activation in approximately 1 minute once the profile is installed |
| Multiple countries in one trip | A new SIM for each country or region | Many plans cover several countries under a single profile |
| Compatibility | Any cell phone with a SIM tray | Only cell phones with an eSIM chip (most mid-to-high-end from 2019-2020) |
If you want the complete technical details of this comparison, with screenshots of the installation process, check out eSIM vs. local SIM.
A real example: what your trip with a local eSIM would be like
Imagine you're spending ten days touring Colombia: you arrive in Bogotá, take a flight to Cartagena mid-week, and conclude your trip in Medellín. With a physical SIM, you would have to find a point of sale as soon as you land in Bogotá, and if your plan is only for the city or has poor coverage in another region, you'd repeat the process.
With a local eSIM for Colombia, the process changes: you install the profile from home, before getting on the plane, using your apartment's Wi-Fi. The plan is "stored" on your phone but doesn't start consuming data yet. You land in Bogotá, activate mobile data, and in approximately one minute, you have internet to call a taxi or open the map, without looking for any counter at the airport. The coverage travels with you to Cartagena and Medellín because the plan is national, not just for one city.
If something doesn't connect well—it happens, though infrequently—you have 24/7 support in all languages via email and WhatsApp, so you don't depend on finding someone who speaks your language in a phone store at ten at night.
This same scheme applies equally to a three-day business trip to Mexico City, a two-week vacation in Europe, or a twelve-hour layover at an airport: the logic of "install before, activate upon arrival" doesn't change.
How to use a local eSIM step-by-step
The complete process, from start to finish, has the following steps:
- Choose your destination plan. Search for the country or region you're traveling to and compare how many gigabytes and how many days you need based on your itinerary.
- Buy the plan online. You don't need to wait until you're at your destination: you can do it from home, with Wi-Fi, days or weeks before you travel.
- Install the profile. You'll receive a QR code or a direct installation link. It installs in a couple of minutes from your phone's settings.
- Leave the profile "on standby." You don't need to activate it as soon as you install it: it can remain stored until the day of your trip.
- Activate it upon landing. Turn on the eSIM's mobile data, and in approximately one minute, you'll have a connection to the local network.
- Use your usual line for calls and WhatsApp. The eSIM handles data; your physical SIM continues to receive messages and calls if your phone allows it.
One point to be clear about before buying: the plan doesn't expire by remaining stored on the phone. You have 180 days to activate the eSIM from the purchase date, so you can buy it in advance—even weeks before the trip, when you have a chance to calmly sort it out—and the plan's validity countdown (the data days) doesn't start until you actually activate it at your destination. Buying early doesn't make you "lose" days of use.
If you prefer a visual tutorial with screenshots of the installation process on iPhone and Android, it's available at how to install an eSIM.
Can I use a local eSIM in any destination?
In practice, yes, in the vast majority of tourist and business destinations: local eSIM plans exist for over 200 destinations, including individual countries and entire regions (for example, a single plan covering several countries in Europe or Southeast Asia). Before purchasing, the only two things to confirm are: that your cell phone has an eSIM chip and is unlocked (not tied to a single operator), and that the specific destination you are going to has a plan available.
Network coverage within the country depends on the local operator each plan works with, just as it would with a physical SIM from that same operator: it's generally strong in cities and tourist routes, and can be more limited in very remote rural areas, regardless of whether the technology is eSIM or traditional SIM.
Where it is worth checking carefully is for trips that combine several countries in a few days: it is advisable to choose a regional plan (that covers all destinations on the itinerary) instead of buying a plan per country, to avoid having to activate and deactivate profiles every time you cross a border.
Local eSIM vs. international roaming: which is better?
Roaming is what happens when you leave your usual SIM in your phone and use data abroad without buying anything additional: your home carrier charges you for that usage, usually at much higher rates than those of a local plan. A local eSIM, on the other hand, connects you as if you were a data customer in the country you are in.
| Aspect | Local eSIM | International Roaming (home carrier) |
|---|---|---|
| Data Cost | Rates close to a local destination plan | Usually the highest price of the three options (physical SIM, eSIM, roaming) |
| Need to buy before traveling | Yes, a specific destination plan | No, it activates automatically when using data outside the country |
| Risk of unexpected expense | Low: you pay a fixed amount defined before traveling | High if you haven't checked your plan conditions with your carrier |
| Your usual number | Remains active on the physical line, in parallel | Remains active (it's the same line) |
| Installation | Digital profile, without going to any store | None: it's already in your phone |
Roaming wins in simplicity—nothing needs to be done—but loses in cost, and is the most common source of cell phone bills with amounts the traveler didn't expect to see upon returning home. If this has already happened to you and you want to understand why, the complete comparison is in eSIM vs. roaming.
When is a local physical SIM better than an eSIM?
Being honest here is part of choosing wisely: a local eSIM is not the best option for everyone. There are at least three scenarios where a local physical SIM still makes sense.
The first is when your cell phone doesn't have an eSIM chip or isn't unlocked: without that technical requirement, even the best deal in the world is useless, because the phone simply cannot install the profile. The second is when you need a real and permanent local phone number—for example, for an immigration process or a rental contract—more than mobile data: in that case, a traditional local line, with its own number, serves a different purpose than a travel data plan. The third is a very long trip (several consecutive months in the same country), where a postpaid or prepaid local plan with automatic renewal might be more convenient than buying travel data plans one after another.
Outside of these three cases, for a tourist or business trip of a few days or weeks, a local eSIM is usually the option with the least friction: no searching for stores, no losing your number, no changing cards. You can see the complete contrast, including the real disadvantages of each format, in eSIM vs. physical SIM.
eSIM-compatible cell phones: what to check before traveling
Before buying any local eSIM plan, it's advisable to confirm two things about your own cell phone, not the plan. The first is whether the model has an eSIM chip: most iPhones from the iPhone XS (2018) onwards have it, as do a good portion of Samsung Galaxy, Google Pixel, and other mid-to-high-end brands from 2019-2020 onwards. The second is whether the cell phone is unlocked (not tied to a single carrier), because a phone tied to a single company may reject eSIM profiles from other carriers even if it technically has the chip.
Both pieces of information can be checked in a couple of minutes from the phone's own settings, without needing third parties or calling anyone: on an iPhone, in Settings → General → About, it indicates if the device supports eSIM; on Android, it varies by manufacturer but is usually found in Settings → Connections → SIM card manager.
If you are not sure about your specific model, the detailed and updated list of compatible cell phones is in eSIM-compatible cell phones. And if after installing the profile something doesn't connect as it should, it's almost always a configuration setting, not a plan problem, before assuming something went wrong.
Frequently Asked Questions
Does a local eSIM completely replace my physical SIM?
Not necessarily. On most modern cell phones, the eSIM works in parallel with your physical line: your number continues to receive calls and WhatsApp messages while the eSIM handles the mobile data for your trip.
Do I need Wi-Fi to install the eSIM before traveling?
Yes, you need an internet connection (Wi-Fi or data) to download the profile for the first time. That's why it's advisable to install it from home before leaving, and not wait until you're at your destination airport without a connection.
What happens if I buy the local eSIM and don't travel immediately?
No problem: you have 180 days from the purchase to activate the eSIM, and that period doesn't depend on when you installed it, but on when you actually activate it at your destination.
Does the local eSIM work for calls and text messages, or only for data?
Most local eSIM plans are designed for mobile data. Traditional calls and text messages usually still go through your usual physical line, while you use the eSIM to browse, use maps, and make internet calls (WhatsApp, FaceTime, etc.).
Can I use a local eSIM if my cell phone is low-end or old?
It depends on the model, not whether it's new or old: some current budget devices do have an eSIM chip and others do not. The safest bet is to check it in your phone's settings before buying any plan.
What do I do if the local eSIM doesn't connect when I arrive at my destination?
First, check that mobile data for that line is activated and that airplane mode is off. If it still doesn't connect, there is 24/7 support in all languages via email and WhatsApp to resolve it without needing to find a physical store at the destination.
Can a local eSIM plan be used for several countries on the same trip?
Yes, there are regional plans that cover several countries under a single profile, in addition to single-country plans. It's advisable to choose a regional plan when the itinerary crosses more than one border.
Is local eSIM slower than a physical SIM?
No, not because it's an eSIM: the speed depends on the local operator's network you connect to (3G, 4G, or 5G), just like with a physical card. eSIM technology itself does not limit connection speed.
Conclusion
The local SIM solved a real problem—the cost of roaming—but with a physical process that doesn't always fit with a travel itinerary. The local eSIM solves the same problem without the inconvenience: you buy the plan from home, install it calmly before you leave, and activate it upon landing in a couple of minutes, while your usual line continues to receive calls and messages.
If your phone has an eSIM chip and is unlocked—you can confirm this in a minute from the settings—it's worth having it ready before your next trip instead of waiting to find a counter upon arrival. You can check the available plans by destination, with coverage in more than 200 destinations and 24/7 support in all languages via email and WhatsApp, in PuraSIM's international eSIM collection. And if you want the complete guide before deciding, with all the steps from beginning to end, it's in the definitive eSIM guide for travel.
