How to activate your eSIM line?
You need three things: an eSIM-compatible mobile phone, the QR code your operator gave you when you purchased the line, and a Wi-Fi connection. Go to Settings, add an eSIM data plan, scan the code, and wait for the system to install the profile. On most devices, it takes a couple of minutes.
If you already have these three elements at hand, skip directly to the step-by-step guide. If you're missing something – you didn't receive the QR code, you don't know if your phone is compatible, or the code no longer works – keep reading, because each of these issues has its own section below.
Before scanning the QR code
Activation almost always fails for the same reason: something from this list is missing before starting, not because the process itself is complicated.
- The QR code or manual activation code. It usually arrives by email or SMS when you purchase the eSIM. Save it where you can open it from another device, not just from the phone you are going to activate.
- An eSIM-compatible mobile phone. Not all models have it, and some that do may be locked to another operator if you bought them in installments or second-hand.
- Stable Wi-Fi connection. The eSIM profile installation is downloaded via the internet; if it is cut off halfway, the process remains incomplete and the code may become invalid.
- A short uninterrupted time. It's quick, but if you leave the Settings screen halfway through the process, on some devices you have to restart the installation from scratch.
One detail that few people consider: if your phone is dual SIM and you already have a physical line working, leave that physical line as the one handling mobile data while you install the eSIM. This way, if the installation is cut off halfway, you won't be left without a connection to try again or to ask for help via WhatsApp.
Step-by-step to activate your Unefon eSIM
The general process is the same for practically any operator, because it is defined by the eSIM technology standard, not by the brand that sold you the line:
- Confirm that you have the QR code or manual code visible, ideally open on a computer or another mobile phone, not on the same device you are going to activate.
- Connect the mobile phone to a Wi-Fi network. Do not do it with mobile data from another line if you can avoid it: it is more stable.
- Go to Settings and look for the option to add an eSIM data plan (the exact path changes depending on whether it is Android or iPhone; you will see it in the next section).
- Scan the QR code with the camera or select the option to enter it manually if the camera does not recognize it.
- Wait for the system to finish installing the profile. Do not close Settings or turn off the screen during this step.
- Configure the line: decide if the eSIM will handle calls, data, or both, and if it will be your primary line.
- Restart your phone if you don't see a signal immediately after installation. On several devices, this solves the problem on its own.
An eSIM QR code can only be scanned once. If you later change phones, do not use the same code again: request a new one from your operator for the new device, because the previous one is already linked to the first.
If you have never installed an eSIM and want to see the process with more screenshots and variations by mobile phone brand, we have a complete eSIM installation guide that covers the same procedure with more visual detail.
How to activate virtual eSIM? Based on your mobile phone
The word "virtual" is just another way to refer to the eSIM (a SIM without a physical card, integrated into the phone's chip). The activation process changes slightly depending on the operating system:
| System | Path in Settings | What it will ask you for |
|---|---|---|
| Android (path varies slightly by brand) | Settings > Connections > SIM card manager > Add eSIM (or Settings > Mobile networks > Add plan) | Scan the QR code with the camera, or enter the manual code |
| iPhone with recent iOS | Settings > Mobile Data > Add eSIM data plan | Scan the QR with the iPhone's own camera, or tap "Enter details manually" |
If you are not sure if your mobile phone model supports eSIM, check it before attempting any steps: installing or uninstalling eSIM profiles on an incompatible device does not work and in some cases leaves confusing error messages that are not related to the code itself. We have a list of eSIM-compatible mobile phones to check your specific model before wasting time.
The QR code doesn't work: causes and solutions
When the QR code or activation process fails, it is almost always one of these five causes. Before contacting support, check the table:
| What you see | Most likely cause | What to do |
|---|---|---|
| "Invalid QR code" or "already used" | The code can only be scanned once, and it has already been used (on this device or another) | Request a new code from the operator; do not insist on using the same QR |
| Camera doesn't recognize the code | Low screen brightness, reflection, or the QR is in a blurry screenshot | Open it from the original email or SMS on another device and increase the brightness |
| Installed, but the phone has no data | The eSIM data plan was not marked as the active line for mobile data | Go to Settings > Mobile Data and select the eSIM as the data line |
| "Could not activate at this time" | You were without Wi-Fi, or with a weak signal, during installation | Connect to a stable Wi-Fi network and try again |
| Settings does not show the "Add eSIM" option | The device is not compatible, or it is locked to another operator | Check the model's compatibility or consult with your previous operator if it is locked |
For a broader list of frequent eSIM failures (not just activation, but also after installation), you can check our guide on common eSIM problems.
How much does a Unefon eSIM cost?
The price depends on the plan you choose and may change over time, so the correct figure is what the official Unefon channel shows you at the time of purchase: their website, app, or point of sale. It's not a data point that makes sense to publish here as if it were fixed, because it would become outdated sooner or later and would end up being unreliable information.
What you can compare fairly, without needing the exact price, is what each type of eSIM is for: a local line like Unefon's is designed for your daily use in Mexico, while a travel eSIM (like those we sell at PuraSIM) is designed only for the days you are outside the country, without touching your main number. Below we compare both.
How to confirm your eSIM is active
Before assuming something went wrong, check these three signs:
- The signal icon changed from "No service" to showing bars or the operator's name at the top of the screen.
- In Settings, the eSIM line appears as "Active" and not as "Pending" or "Disabled".
- You can browse without Wi-Fi. Open any page with mobile data activated (and Wi-Fi turned off, to rule out using that connection) and confirm that it loads.
If you installed the profile but don't see any of these three signs after restarting your phone once, it's most likely a problem on the operator's side (the line has not yet been activated in their system) and not with your phone. In that case, the next step is to contact Unefon support directly with the line number or order in hand.
How can I switch to an AT&T eSIM?
The process of porting your number to another operator with eSIM has two separate parts: number portability (managed by the new operator, not manually by you) and the technical installation of the eSIM on your phone, which follows the same general steps we saw in the step-by-step section: you receive a QR code from the new operator, scan it from Settings, and wait for it to install.
The difference is that, when changing operators and not just lines, your previous SIM (physical or eSIM) is normally deactivated once the number is ported, so it's advisable to have the new eSIM installed and tested before that happens, to avoid being without service in the middle of the change.
When the problem isn't activation, but roaming
There is a distinct case that is often confused with "the eSIM not activating": you are outside Mexico, your Unefon line works in your country, but abroad you have no data, or roaming is very expensive. In that case, the problem is not with installation, but with international coverage, and the solution is not to reinstall anything, but to use an eSIM specifically designed for travel.
This is a different topic from what you see in this guide. If you want to understand the difference between relying on your usual operator's roaming and buying a separate travel eSIM, we have a dedicated comparison in eSIM vs. international roaming.
Local eSIM vs. international travel eSIM
It's worth being clear about when each type of eSIM is convenient, because they don't compete with each other: they solve different things.
| Criteria | Local eSIM (daily use in Mexico) | International Travel eSIM (PuraSIM) |
|---|---|---|
| What it's for | Your main line: calls, SMS, and daily data | Only mobile data while traveling, without touching your main number |
| Coverage | National network of the chosen operator | More than 200 destinations, depending on the country or region you visit |
| Activation time | Depends on the operator's internal processes | Approximately 1 minute once you activate it |
| Support if something goes wrong | Local operator's customer service channels | 24/7 in all languages, by email and WhatsApp |
| Period of use | According to your monthly plan's validity | 180 days to activate it from the moment you purchase it |
If your situation is exactly that – you're going to travel and don't want to depend on your local line's roaming – you can check the plans by destination in our international eSIM collection. And if you're still not sure what an eSIM is exactly or how it differs from the traditional physical SIM, these two guides explain it from scratch: what is an eSIM and eSIM vs. physical SIM.
Frequently Asked Questions
Do I need Wi-Fi to activate the eSIM?
Yes, it is recommended. The eSIM profile installation is downloaded via the internet, and doing so with a stable Wi-Fi connection reduces the risk of the process being cut off halfway.
Can I have both my eSIM and physical SIM active at the same time?
It depends on the phone. Most eSIM-equipped devices are dual SIM, meaning they support both a physical SIM and an eSIM functioning simultaneously, each with its own line.
What happens if I lose the QR code before scanning it?
Contact the support of the operator who gave it to you and ask them to resend it or generate a new one. There is no way to "recover" it yourself if you didn't save it.
Can I transfer the same eSIM to a new phone?
Not directly. An eSIM QR code can usually only be scanned once. To move it to a new device, you need to ask your operator for a new code for that phone.
How long does it take for an eSIM to activate after scanning the code?
The technical installation of the profile usually takes a couple of minutes. For the line to become fully functional with a signal might take a bit longer, depending on the operator's timings.
Do I need to unlock my phone to use an eSIM?
If your phone is locked to another operator (common when purchased on an installment plan), you will likely need to resolve that lock first before you can install an eSIM from a different operator.
Does the eSIM work in any country without doing anything else?
A local eSIM (like one from a Mexican operator) does not give you automatic coverage abroad without active roaming. For that, there are travel eSIMs, specifically designed for use in other countries.
In summary
Activating a Unefon eSIM is, in most cases, a quick and simple process: QR code, stable Wi-Fi, and the correct path in Settings depending on your mobile phone. If something goes wrong, it's almost always due to an already used code, a weak signal during installation, or an incompatible device, and all three have quick solutions, as you saw above.
However, if the real reason you came to this guide is that you are traveling and are concerned about running out of data outside of Mexico (not a problem with your local line), that is another need. For those specific days, an international travel eSIM solves something that your local line is not designed to solve: coverage at your destination, activation in about 1 minute, and 24/7 support in all languages via email and WhatsApp if something doesn't work. You can check available destinations in the PuraSIM international eSIM collection.
