What does it mean to have an eSIM "with the same number" when traveling?
It means that your Unefon number remains active, unchanged, while you use a second line (the eSIM) solely for internet browsing during your trip. You don't transfer the number anywhere: you keep it on your physical SIM card and add an additional data line for your destination.
This confusion is very common because the term "eSIM" sounds like it replaces your current SIM card. In practice, almost all modern cell phones allow you to have two active lines at the same time: a physical one (your Unefon SIM, with your number) and an eSIM (a digital profile installed via QR code or app). Each line fulfills a different function and they don't interfere with each other.
When someone searches for "Unefon eSIM same number," they are almost always trying to solve one of three problems: continuing to receive calls and WhatsApp messages on their Mexican number while traveling, avoiding international roaming charges from their operator, or understanding if they can simply "transfer" their Unefon line to eSIM format. We will address all three, one by one.
Can your Unefon number be directly converted to an eSIM?
It depends on Unefon, not a third party. The availability of eSIMs on Mexican prepaid operators varies by plan and phone model, and that decision is made independently by each operator. Before assuming it's possible or impossible, the most reliable approach is to consult directly with Unefon: through their app, official website, or a service center.
What you can control without relying on Unefon is your data connection abroad. This is where a data eSIM like PuraSIM's comes in: it doesn't touch your Unefon line at all, it simply adds a second line dedicated to internet in the country you're traveling to. If you want to understand the difference between this type of eSIM and a traditional physical SIM, the guide eSIM vs. physical SIM explains it in more detail.
Your number lives on the SIM you use for calls and SMS. A data eSIM for travel is an additional line, not a replacement: installing it does not change or delete your Unefon number.
How much does a Unefon eSIM cost?
The cost of an eSIM issued by Unefon (if your plan and phone are compatible) depends on the operator's current prices, and only Unefon can give you a reliable and updated figure: telecommunications prices change frequently, and publishing a number here without verifying it directly with them would be dishonest on our part.
What we can tell you is how the cost of a data eSIM for travel works, which is a different product: you pay for the data plan of the destination (e.g., United States, Europe, or a South American country), not for your number. It's a one-time purchase before or during the trip, separate from your bill or balance with Unefon. You can check the available plans by country in PuraSIM's international destinations collection.
Can a Unefon SIM card be used in an AT&T phone?
Yes, generally, because Unefon is a prepaid brand that operates on AT&T Mexico's network. This means they technically share the same network infrastructure. Whether the SIM card works well in a phone labeled "AT&T" primarily depends on two things: that the phone is unlocked (not tied to another operator) and that it supports the frequency bands used by that network in Mexico.
This is different from the topic of eSIMs. A phone can be fully compatible with the Unefon/AT&T network and, at the same time, not physically have eSIM technology (this depends on the device's hardware, not the operator). If you don't know if your phone has this feature, in the section which phones are compatible with eSIM? below, we provide a general reference by brand and range.
How to transfer your personal number to eSIM without losing the line?
If what you're looking for is to literally migrate your current number (the one you already have with Unefon) from a physical SIM to eSIM format, that process depends exclusively on your operator: it is Unefon who issues the new eSIM profile associated with your number, checks that your plan allows it, and guides you through the process from their app or a service point. This is not something that a data eSIM for travel can or should try to replace, because it does not manage numbers or portability.
If, on the other hand, your real goal is "not to lose my line while traveling, but also not to pay expensive roaming," you don't need to move your number anywhere. That is exactly the scenario we solve in the next section with the dual SIM approach, which for most travelers is simpler and cheaper than managing a format change with your operator.
The real solution for traveling: dual SIM (your number + international data)
The combination that solves the vast majority of searches for "Unefon eSIM same number" is this: you leave your Unefon SIM card as it is, in the phone's physical tray, and add a data eSIM for the country you're visiting. The phone will then operate with two lines simultaneously, each with a distinct job.
Your Unefon line continues to receive calls, SMS, and app notifications like WhatsApp (which are tied to your number, not your data connection). The eSIM, meanwhile, ensures you have internet at your destination without your Mexican operator charging you international roaming for every megabyte. To install an eSIM step-by-step, without technical jargon, the guide how to install an eSIM walks you through the entire process, and if you've never used one, it first explains what it is and how it works.
With a PuraSIM eSIM specifically, installation is done via QR code or a direct link, and the line is ready for use in approximately 1 minute once you activate the plan in the destination country. There's no need to wait for a physical SIM card by mail or go to a store.
Practical example: a trip from Mexico City to the United States
To make it clearer, imagine the case of someone with a prepaid Unefon line who travels for ten days to Los Angeles for work. Before leaving, while still having Wi-Fi at home, they install a data eSIM for the United States on their cell phone (this is key: it's best to download the profile in advance, not at the airport with limited data).
During the trip, they leave their Unefon SIM in "calls and SMS only" mode and activate the eSIM as a data line. The result: they continue to receive calls and WhatsApp messages on their usual number — family, work, banks sending them codes via SMS — while browsing, using maps, and working from their cell phone with the eSIM's connection, without Unefon charging them roaming for the data consumed in the United States.
Upon returning to Mexico, they simply deactivate or delete the eSIM profile (or save it for the next trip) and their cell phone reverts to functioning as usual with the Unefon line. At no point was their number at risk, nor did they have to complete any portability procedures.
Data eSIM vs. international roaming: comparison table
Before deciding what is best for a specific trip, it is worth comparing the two available options: activating international roaming with your operator or installing a separate data eSIM. If you want to delve deeper into this comparison, the guide eSIM vs. roaming goes into more detail.
| Aspect | International Roaming (with your operator) | Data eSIM for Travel |
|---|---|---|
| Your Unefon Number | Maintained, unchanged | Maintained, unchanged |
| What it Covers | Depends on the package activated by your operator | Mobile data only (internet) |
| Where it's Activated | Directly with your operator, before or during the trip | From an app or browser, before leaving |
| Do you need to change physical SIM? | No | No (installed as an additional digital profile) |
| Validity of Purchase | As set by your operator | Up to 180 days to activate from purchase date |
| Support if something goes wrong | Your operator's channels | Email and WhatsApp, 24/7, in multiple languages |
Which phones are compatible with eSIM?
Not all cell phones have eSIM technology, although it's quite common in devices from recent years. As a general reference by brand (always confirm your exact model in the phone's settings, under mobile data or SIM):
| Brand | General Range Compatible with eSIM |
|---|---|
| Apple | iPhone XS/XR and later |
| Samsung | Recent Galaxy S and Galaxy Z series (verify exact model, not all regional versions include eSIM) |
| Pixel 3 and later | |
| Motorola | Some recent high-end and mid-range models |
The quickest way to confirm is to search for "eSIM" in your phone's settings, within the mobile networks menu. If the option to "add eSIM" or "add data plan" appears, your device is compatible. The guide eSIM-compatible phones has a more complete list by model.
Common mistakes when setting up dual SIM
Most problems with dual SIM are not with the eSIM itself, but with the phone's configuration. These are the most common:
- Installing the eSIM at the airport, with poor signal: the profile needs an internet connection to download. Do it before you travel, with Wi-Fi.
- Leaving the Unefon line as the default data line: if you don't manually change which line uses mobile data, the phone may keep trying to use Unefon for roaming even if the eSIM is already installed. This is a very common mistake and almost no one checks it before traveling.
- Not activating data roaming for the eSIM line: although it sounds contradictory, some phones require this option to be specifically activated for the eSIM line at the destination, or the connection won't work.
- Confusing "install" with "activate": with PuraSIM, you can install the profile before your trip and activate it just when you arrive at your destination, so you don't waste validity days without using it.
If you encounter anything that doesn't add up during installation, the guide common eSIM problems covers the most frequent issues and how to resolve them.
Frequently asked questions
Do I need an unlocked phone to use an eSIM with my Unefon number in dual SIM mode?
Yes, generally, the phone must be unlocked (not carrier-locked) to be able to add an additional eSIM line to your Unefon one. If your phone was purchased on installments or subsidized by a carrier, first check if it has any active locks.
Can I receive WhatsApp and calls on my Unefon number while using eSIM data abroad?
Yes. WhatsApp and calls are tied to your number, not to which line you use for browsing. As long as your Unefon SIM remains in your phone and you have an internet connection (the eSIM's, in this case), your WhatsApp will function normally.
What if my phone doesn't have eSIM, only dual physical SIM?
If your phone accepts two physical SIM cards but doesn't have an eSIM, you can use your Unefon SIM in one tray and purchase a local physical SIM (or from an international operator) in the other. The logic is the same as with an eSIM: one line for your number, another for data at the destination.
Is the PuraSIM eSIM for calls or only for data?
It's a data eSIM: it's for browsing, using maps, social media, and internet-based messaging apps (like WhatsApp or video calls). Traditional calls and SMS still depend on your Unefon line.
How long before traveling should I install the eSIM?
You can install it as soon as you buy it, even several days before your trip, always with Wi-Fi available. You have up to 180 days from purchase to activate it, so there's no rush to use it immediately, only to install it with a good connection.
What happens if I accidentally delete the eSIM profile, do I lose my Unefon number?
No. The eSIM and your Unefon number are completely independent lines. Deleting the eSIM profile only removes that data line; your Unefon SIM and number remain intact on your phone.
Does the eSIM work in every country I travel to?
PuraSIM covers over 200 destinations, so it's likely that the country you're traveling to is available. You can check directly in the collection of destinations before purchasing.
What should I do if I have a problem with the installation or connection?
You can write via email or WhatsApp: support is available 24/7 in several languages, so it doesn't depend on the time zone of the country you traveled to.
Conclusion: what to do before your next trip
If your question was whether you can "convert" your Unefon number to eSIM, the short answer is that it depends on Unefon, and you need to confirm it directly with them. But if your real question was how to travel without losing your number and without paying expensive roaming, you already have the answer: leave your Unefon SIM as it is and add a data eSIM just for the destination.
It's the simplest option because it doesn't depend on procedures with your operator, it installs in minutes, and you can do it before leaving home. If you want to see the full picture before deciding, the definitive eSIM guide for traveling gathers everything you need to know in one place.
