Where can I buy an eSIM and what options are there?
You can buy an eSIM in three places: your local carrier's app or official website (with an international package for your usual line), the website of an independent international provider like PuraSIM, or a counter at the destination airport. Each option changes coverage, when you pay, and how long it takes to get data.
The first option—local carrier—is the simplest if you're going to a single country and already have a plan with international roaming: you activate an additional package from the same app you use every day and keep your usual number. The downside appears when your trip crosses several countries or when that international package simply doesn't cover your destination.
The second option—an independent international provider—sells data eSIM profiles that do not depend on your original carrier or your number. They are purchased online, anytime and from any country, and usually cover dozens of destinations with the same type of plan. If you don't know exactly what an eSIM is or how it differs from a physical card, it's a good idea to understand that basic concept before comparing prices: you can review what an eSIM is and how it works before continuing.
The third option—buying at the airport or at a physical store at your destination—almost always means paying more for immediacy and depending on stock or staff availability at that moment, which is beyond your control.
How do you buy an eSIM online, step by step?
The process is the same regardless of the provider you choose, although the details of each store vary:
- Confirm your phone accepts eSIM. Not all models support it, and some carriers block the feature even if the hardware has it.
- Choose the plan based on your destination and actual trip duration. Buying extra "just in case" only makes the plan unnecessarily more expensive.
- Pay online with your email address. You don't need a physical address or to receive anything by mail.
- You receive a QR code and instructions by email. This code is what installs the data profile on your phone.
- Install the eSIM profile with Wi-Fi, before traveling. It's important to know that installing and activating are two different steps: installing the profile does not consume your validity period or start using data; it only saves the profile on your phone. You can review the complete process in how to install an eSIM.
- Activate data when you actually need it. With PuraSIM, activation takes approximately 1 minute, and you have 180 days from purchase to activate it, so you can calmly install it at home and activate it only upon landing.
This margin between installing and activating saves a lot of headaches: it allows you to check at home, with Wi-Fi and without rushing, that the profile was installed correctly and that your phone recognizes it, instead of discovering a compatibility issue while standing in the immigration line.
Local carrier eSIM vs. international eSIM: objective comparison
Neither option is inherently better; it depends on the trip. This table compares the criteria that truly change the outcome, not those used for selling:
| Criterion | Local carrier eSIM (international package) | International eSIM from an independent provider |
|---|---|---|
| Coverage | Limited to countries with which your carrier has a roaming agreement | Coverage in over 200 destinations with the same profile type |
| Where to buy | Carrier's app or official website, usually before leaving your country | Provider's website, from anywhere, anytime |
| Activation | Usually activates automatically upon detecting the destination country's network | Manual activation, controlled by you, in approximately 1 minute |
| Your usual number | Stays the same: you continue to receive calls and SMS on your usual line | Does not change either, because the data eSIM is independent and coexists with your physical SIM |
| Best for | A single country, short trips, those who don't want to mess with settings | Multiple countries in one trip, long stays, those who compare before leaving |
If your itinerary covers more than one country, comparing before buying is especially relevant because your carrier's package may exclude some destinations without clearly informing you. You can also check if it's worth comparing an eSIM with traditional roaming before deciding.
How much does a local carrier like Telcel charge for a travel eSIM?
There's no single figure: the cost of a travel eSIM with a local carrier depends on the international data package you activate, the destination, the duration, and whether you already have a postpaid plan that includes roaming. This information changes frequently and is only reliable if you consult it directly in the carrier's app or official website on the same day you plan to purchase.
What you can objectively compare, without relying on an outdated price, are the criteria in the table above: how many countries the package actually covers, whether activation is automatic or manual, and whether you need to maintain a contract with that carrier to access the offer. These three points usually weigh more in the final decision than the exact price at a given moment.
The criteria that really matter when comparing eSIM providers
Most eSIM comparisons online are written by someone who sells one of the options they compare, so it's a good idea to have your own criteria before reading any recommendation, including this one:
| Criterion | Why it matters | What to check before paying |
|---|---|---|
| Actual coverage at your destination | A plan described as "international" doesn't always include your specific country | Search for the exact country in the destination finder, not just the region or continent |
| Fair usage policy on "unlimited" plans | Almost no unlimited plan is without any conditions | Confirm if there's a daily or total high-speed limit before it's reduced |
| Support channel and hours | If the eSIM fails mid-trip, you need to resolve it that same day | Ask if support is 24/7 and in what languages; PuraSIM offers it via email and WhatsApp in all languages |
| Activation period from purchase | You rarely buy on the same day you start traveling | Confirm how many days you have from purchase to activate; with PuraSIM, it's 180 days |
| Refund policy | A data plan that has already been activated usually cannot be returned | Review the exchange and refund policy before buying, not after a problem arises |
None of these criteria depend on opinion: they are verified by reading the provider's terms before paying, which makes them much more reliable than a comparison that only speaks well of one option.
When NOT to buy an eSIM
Recommending an international eSIM for every trip would be as dishonest as inflating a comparison. There are scenarios where another option works better:
- You're traveling to a single country and your local carrier already has a package that covers it at a good cost. Changing solutions just to try something new doesn't add anything.
- Your phone doesn't support eSIM or is locked by the carrier. In that case, a physical SIM is still the only real option, no matter how convincing the rest of the comparison is.
- You need to receive verification SMS to a local number in the country you're visiting. A data eSIM doesn't solve that; for that specific case, a local SIM with its own number is needed.
- You won't have Wi-Fi connectivity to install the profile before traveling and your destination has unreliable network coverage. Installing the eSIM profile requires a stable connection at least once.
If your local carrier already has an international package that covers exactly the country you're going to and the days you'll be away, that might be the simplest option for that particular trip. An international eSIM isn't the right answer for all trips: it's the right answer when you cross borders, travel frequently, or want to control data spending without going to a physical store.
Common mistakes when buying an eSIM
Most problems with an eSIM don't come from the provider, but from decisions made at the time of purchase. Some of the most frequent are:
- Buying on the same day as your flight. If something goes wrong with the installation—weak Wi-Fi, incompatible phone—there's no time left to resolve it calmly.
- Confusing "install" with "activate." Activating too early starts counting the plan's validity days even if you haven't traveled yet.
- Not checking if your phone is unlocked. A device locked to one carrier may reject eSIM profiles from other providers.
- Buying a generic "regional" plan without verifying the exact country. Some regional plans exclude specific countries from the list.
- Deleting the eSIM profile too early. Once deleted, almost no provider can recover it; you'll have to buy it again.
If you've already had a bad experience with an eSIM—no signal, unable to activate, not knowing who to contact—it's worth reviewing the complete list of common eSIM problems and how to resolve them before completely dismissing the technology.
eSIM vs. physical SIM vs. roaming: what's best depending on your trip
All three technologies solve the same problem—having data outside your country—in different ways, and none is superior in all cases:
- Roaming from your home carrier: zero friction because you don't change anything, but it's usually the most expensive option per day if your plan doesn't include the country you're visiting.
- Local physical SIM: normally the cheapest at the destination, but it means finding a point of sale, changing numbers, and losing your original SIM while using it.
- International eSIM: coexists with your physical SIM, is purchased before leaving, and doesn't depend on finding a physical store upon arrival, although it requires a compatible phone.
For a more detailed comparison between the two most commonly confused options, it's helpful to review eSIM vs. physical SIM with examples of when each wins.
Is your phone compatible? What to check before buying
Before comparing prices or providers, this is the filter that eliminates half of the doubts: if your phone doesn't support eSIM, no other advantage matters. Compatibility depends on two things—that the device's hardware has the function and that the carrier hasn't blocked it by software—and both must be confirmed separately, because a phone can have the hardware and still be blocked if it was purchased financed with a carrier.
The quickest way to confirm is to check the list of eSIM compatible phones and, if your model appears, verify in the device's settings that the "add eSIM plan" option is available before paying for any plan.
Frequently asked questions
Do I need to unlock my phone to use an eSIM?
If your phone is locked to a specific carrier, that carrier may prevent the installation of eSIM profiles from other providers. It's advisable to confirm this with your current carrier before purchasing.
Can I use my regular WhatsApp number with a data eSIM?
Yes. The international data eSIM coexists with your physical SIM and your usual number, so apps like WhatsApp continue to work with your usual number while you use data from the eSIM.
What happens if I buy an eSIM and ultimately don't travel?
As long as you don't activate the plan, the installed profile does not start consuming data or counting validity days. Review the provider's refund policy for cases where it has already been activated.
Can I install the eSIM before traveling without activating it?
Yes, installing and activating are distinct steps. You can install the profile with Wi-Fi at home, at your leisure, and activate it only when you arrive at your destination.
Do I need Wi-Fi to install the eSIM?
Yes, a stable internet connection—Wi-Fi or data—is needed at least during the installation of the profile via the QR code. Once installed, it is no longer necessary.
Can I have an eSIM and my physical SIM active at the same time?
Most eSIM-enabled phones allow both to be active: the physical SIM for calls and SMS from your usual number, and the eSIM for travel data.
What do I do if my eSIM has no signal upon arriving at my destination?
First, check that the data profile is activated and that your phone is configured to use the eSIM's data line, not the physical SIM's. If the problem persists, contact the provider's support: PuraSIM offers 24/7 support in all languages via email and WhatsApp.
Conclusion: which eSIM is best for each type of traveler
There's no single right answer, but there is a concrete recommendation depending on the type of trip:
- Single-country, short trip with a carrier that already covers that destination well: first check your own carrier's international package before looking for another option.
- Trip crossing several countries or an entire region: an international eSIM avoids buying a package for each border and covers more than 200 destinations with the same profile.
- Frequent travel or remote work from different countries: installing the profile once and activating it each time you arrive at a new destination, within 180 days from purchase, is more practical than managing physical SIMs at each stop.
- Last-minute trip, with your phone already in hand at the airport: buying in advance is still better, but if there's no time left, prioritize a provider with quick activation and available support that same day.
If your next trip falls into any of the first three cases, you can check the available plans by destination in the international eSIM collection and compare coverage and duration before deciding which one to activate.
