What Saily eSIM is and who develops it
Saily is an eSIM application for travelers that sells prepaid data plans for over 200 destinations, without a physical card or long-term contract. It is developed by Nord Security, the same company behind NordVPN and NordPass, which launched it as an independent product within its digital security ecosystem.
This origin is not a minor detail: Saily itself uses it as a selling point. In its help center, the company explains it as follows:
"Saily's eSIM service belongs to Nord Security, a global brand specializing in digital security and privacy. Nord Security is also the company that develops tools such as NordVPN and NordPass."
(Source: saily.com/es/, consulted on August 2, 2026.)
In practice, this means that each Saily plan includes, in addition to mobile data, a suite of security features: ad blocker, virtual location change, and protection against malicious websites. If you have never used an eSIM and want to first understand the basic concept—what it is, how it differs from a physical SIM, and why most new cell phones support it—it is advisable to start with what an eSIM is before comparing providers.
How Saily eSIM works step-by-step
Saily's process is the same one used by most travel eSIMs, with some unique features. First, you choose your destination and data plan within the app or on the website; then you download the Saily app from the App Store or Google Play; and finally, you install the eSIM by scanning a QR code or with direct installation if your cell phone supports it.
Once installed, you need to activate two separate things in your phone settings: the Saily eSIM itself and data roaming. Without both activated, the plan will not connect to any network even if you have already purchased it. Not all cell phones support eSIM or allow two active lines at the same time, so it's advisable to check the list of eSIM compatible phones before buying.
A plus: Saily allows connection sharing via hotspot without additional restrictions, and data top-ups within the same plan are automatically activated when the previous balance runs out, without needing to reinstall anything.
How to activate Saily eSIM
Saily's activation is automatic by geolocation: as soon as the phone detects a network in the destination country with data roaming turned on, the plan starts automatically. The specific steps are:
- Purchase the plan for the chosen destination in the app or on saily.com.
- Install the eSIM by following the QR code (received by email if purchased via the web) or the direct link if purchased from the app.
- Activate the Saily eSIM line in the phone settings.
- Activate data roaming for that specific line.
- Wait to land: the plan connects automatically upon detecting the local network.
There's a detail worth keeping in mind that isn't always clear when purchasing: the plan has a 30-day activation window from the date of purchase. If you haven't traveled yet when that period expires, Saily will activate the plan automatically anyway, even if the phone is still in the country of origin. The company itself confirms this with an example in its help section: if you buy the plan today and don't activate it, it will activate automatically after 30 days. For someone who buys the eSIM well in advance and then has their flight delayed, this could mean that the day counter—and for time-based plans, also the data counter—is already running before boarding the plane. It's worth buying the plan closer to the actual travel date, not as soon as the ticket is booked. (Source: saily.com/es/esim-mexico/, consulted on August 2, 2026.) If you get stuck at any point in the installation, the guide on how to install an eSIM covers specific operating system settings.
Saily in Mexico and the rest of Latin America
Yes, Saily works in Mexico. According to its own destination page, coverage reaches major cities and tourist areas—Mexico City, Cancun, Puerto Vallarta, Playa del Carmen, Tulum, Guadalajara, and Cabo San Lucas—although the company itself warns that the signal may be limited in rural and remote areas of the country. (Source: saily.com/es/esim-mexico/, consulted on August 2, 2026.)
For those traveling through several countries in the region, Saily also sells regional plans: one for Latin America that includes Mexico and the United States, and a more restricted North America plan. If your route crosses from Mexico to the United States, the regional plan avoids buying two separate eSIMs; if, on the other hand, you go south towards South America, that same Latin America plan will not cover your entire journey, because its coverage does not include all South American destinations.
Mexico is also included in Saily's global plan, designed for itineraries that touch several continents on the same trip. (Source: saily.com/es/esim-mexico/, consulted on August 2, 2026.)
How much Saily eSIM costs: verified plans and prices
Saily prices vary by destination and change over time, so the most honest approach is to show a snapshot with a date, not a table that is valid indefinitely. This is what its Mexico page offered when this article was consulted:
| Plan | Data | Duration |
|---|---|---|
| Basic | 1 GB | 7 days |
| Standard | 3 GB | 30 days |
| Standard | 5 GB | 30 days |
| Recommended | 10 GB | 30 days |
| Fast Lane | 20 GB | 30 days |
| Unlimited (Saily designation) | No declared GB limit; terms of use in its own policy | 5 to 30 days |
Source: saily.com/es/esim-mexico/, consulted on August 2, 2026. Prices subject to change by Saily; verify the current price on their own page before purchasing.
One nuance that Saily doesn't always highlight in its price summary: the 10 GB plan includes a full month of NordVPN as a gift. It's a valuable extra, but it only applies to that specific plan, not the rest of the catalog.
How good is Saily eSIM: real strengths and limitations
Objectively evaluated, Saily has clear advantages and others that should be known before purchasing, not afterwards.
Pros: 24/7 customer support via live chat and email, automatic activation by geolocation, automatic data top-ups without reinstalling the eSIM, unrestricted hotspot functionality, and integrated security features (ad blocker, virtual location, web protection) included within the data plan itself. (Source: saily.com/es/esim-mexico/ and saily.com/es/, consulted on August 2, 2026.)
Cons, or at least things to consider: Saily plans are data-only by default—without a dedicated number for calls or SMS—so calls depend on apps like WhatsApp or FaceTime unless a separate US number is contracted, with an additional monthly fee and identity verification. Support is provided via chat and email. And the 30-day activation window is short—compared to PuraSIM's 180 days—which penalizes those who purchase far in advance and then have their travel dates change. (Source: saily.com/es/, consulted on August 2, 2026.)
Saily vs. PuraSIM: objective comparison
With the verified data from the previous two sections, here's a direct comparison between both services based on the most important criteria for travelers:
| Criterion | Saily | PuraSIM |
|---|---|---|
| Covered destinations | More than 200 destinations | More than 200 destinations |
| Activation window from purchase | 30 days | 180 days |
| Support channels | In-app chat and email | Email and WhatsApp |
| Support availability | 24/7 | 24/7 in all languages |
| Activation time upon arrival | Automatic by geolocation | Approximately 1 minute |
| Included security features | Ad blocker, virtual location, web protection | Not included |
| Own phone number | Optional, U.S., separate charge | Not available |
The most practical difference for those traveling with flexible dates—rescheduled flights, long layovers, last-minute plan changes—is the activation window: 180 days gives much more leeway than Saily's 30 days before the plan starts running on its own. In exchange, Saily adds a package of security tools that PuraSIM does not offer integrated. PuraSIM's specific prices and plans vary by destination and are updated frequently, so the reliable reference is always the international eSIM collection at the time of purchase, not a fixed figure in an article.
Saily eSIM versus physical SIM and traditional roaming
Beyond the comparison with another eSIM provider, it's worth positioning Saily against the two traditional alternatives: buying a physical SIM at the destination or activating your local operator's roaming.
| Option | How to contract | Time until data is available | Main risk |
|---|---|---|---|
| Travel eSIM (Saily or other) | From the app, before or during the trip | Minutes, with Wi-Fi or data available | Depends on the provider's coverage in that country |
| Local physical SIM | At a store or airport upon arrival | May involve queues and registration procedures | Requires an unlocked phone and sometimes local ID |
| Home operator roaming | Automatic, no action required | Immediate | Charges are usually higher than a prepaid plan |
The eSIM—from Saily, PuraSIM, or any other reputable provider—solves the main problem of physical SIMs (wasting time upon landing) and the biggest impact of traditional roaming (paying per megabyte without knowing how much you'll spend). If you want to delve deeper into this comparison, the guide on eSIM versus roaming goes into more detail than can be covered here.
Which is better, Saily or Holafly
This is the most frequently asked question alongside Saily's name, and the short and honest answer is that it depends on the criterion that matters most to you: price per gigabyte, whether you prefer plans by data amount or only unlimited plans, each one's activation window, and what support channels each company offers. Comparing these points one by one, with source and date for each Holafly data point as we did here with Saily's, requires more space than this article focused on Saily has.
For that specific comparison, there is already a dedicated guide: Saily vs. Holafly, with the same requirement for verifiable data as this article.
When Saily is convenient and when another eSIM is convenient
Saily makes sense when your trip has fairly fixed dates—so the 30-day window isn't an issue—when you value having an ad blocker and virtual location change without installing a separate app, and when you're content with receiving support via chat and email without needing a channel like WhatsApp.
It's advisable to look for another option when you buy the eSIM well in advance and your travel date can still change, when you prefer to be able to message via WhatsApp instead of relying on in-app chat, or when your itinerary crosses several regions that don't fit into a single Saily regional plan and would force you to buy several plans separately. None of these things make a provider bad: they are different features for different trips, and it's worth choosing based on your actual itinerary, not based on which one sounds more familiar.
Frequently asked questions
Do I need Wi-Fi to install Saily eSIM before traveling?
Yes, you need an internet connection—Wi-Fi or data—to download the app and install the eSIM profile, but it doesn't have to be at the destination. It can be installed days in advance from home; the plan simply won't start consuming data until it's activated.
Can I use Saily and my physical SIM at the same time?
Yes, as long as your phone supports dual SIM (physical SIM plus eSIM), which is common in most recent models. You can leave your physical SIM for calls with your usual number and use the Saily eSIM only for data.
What happens if I run out of data on my Saily plan halfway through my trip?
You can top up more gigabytes from the same app without reinstalling anything, and even activate automatic top-ups so that the next package activates automatically as soon as the previous one runs out.
Does Saily include a phone number for calls and SMS?
Not by default: Saily plans are data-only. You can contract a US number separately, with an additional monthly charge, for calls and messages, or use apps like WhatsApp or FaceTime with the normal data plan.
How long does it take for the eSIM to arrive after purchase?
If the purchase is made on the website, the QR code arrives by email almost immediately; if it is made from the app, the plan appears directly in the user's profile without any additional waiting.
Can I request a refund if Saily eSIM doesn't work?
Saily states that it offers refunds, although the exact conditions (deadlines, covered cases) are in its own legal policy, not on the product pages. Before purchasing, it is advisable to review it directly on their site to know what it covers in your case.
Can the same Saily eSIM be used for multiple trips?
Yes: new destination plans can be added to the same already installed eSIM, without having to install a different profile every time you change countries.
Why isn't my Saily eSIM connecting when I arrive?
The most common causes are a QR code that has already been scanned (it only works once), the eSIM being installed but not activated in the phone settings, or data roaming being turned off for that line. Checking these three points resolves most cases.
Conclusion
Saily is a real eSIM service, backed by Nord Security, with broad coverage and security features that few competitors integrate by default. It also has specific and verifiable limitations: data-only plans, support without a phone or WhatsApp channel, and an activation window of just 30 days that can work against you if your travel date isn't set. None of these points are hidden flaws: they are in its own documentation, with a consultation date, so you can make a decision with real information and not just based on brand recognition.
If you're looking for an eSIM with more flexibility to activate the plan when your itinerary might still change, and you prefer to be able to resolve queries via WhatsApp in addition to email, you can check out the available plans by destination in PuraSIM's international eSIM collection. And if you want a broader overview of how to choose an eSIM for any trip, not just compared to Saily, the definitive guide to eSIMs for travel gathers the criteria that apply no matter which provider you end up choosing.
