How to use an eSIM on iPhone?
To use an eSIM on your iPhone, you need to buy it online, install the QR code or profile sent to you by email, wait for the phone to activate it, and choose that line for mobile data. The entire process takes a few minutes and does not require opening the SIM tray.
It sounds simple because it is, but if you've never done it, each step brings its own question: Is my iPhone compatible? Will I lose my number? What if I don't have Wi-Fi upon arrival? This guide answers all of that in order, with a real travel example so you can see what it's like to use it from beginning to end, not just how to install it.
If you already know what an eSIM is and just want the installation steps, skip directly to Section 5. If you're still unclear on the concept, keep reading from here.
What is an eSIM and how does it differ from your physical SIM?
An eSIM is a digital version of a SIM card: instead of a plastic card that you insert into your phone's tray, it's a chip soldered inside the iPhone itself that is programmed remotely. Where you once had to go to a store, buy a physical SIM, and wait for the phone to recognize it, now that same process happens by installing a digital profile, without leaving your home or touching the phone with a paperclip.
Functionally, it does the same as a physical SIM: it connects you to a mobile network, assigns you a number (if the plan includes it), and gives you access to data, calls, or messages depending on what you've contracted. The difference is in how it reaches your iPhone and that you can have several profiles saved at once, which is impossible with a physical plastic SIM unless you carry multiple cards.
For a traveler, this changes the problem at its root: instead of looking for a phone counter at the arrival airport, you activate your data plan before boarding the plane and arrive already connected. If you want the complete technical detail of how eSIM technology works beyond the iPhone, you can check out this guide on what an eSIM is.
Which iPhone models are compatible with eSIM?
Apple introduced eSIM in the iPhone XS, XS Max, and XR, and has included it in virtually all subsequent models. The exception is units originally sold in mainland China, which instead come with a dual tray for two physical SIMs.
| iPhone Model | Does it have eSIM? | Note |
|---|---|---|
| iPhone 8 and earlier | No | Does not include the eSIM chip |
| iPhone XS, XS Max, XR | Yes | First compatible models |
| iPhone 11, 12, 13 (all variants) | Yes | Includes Pro and Pro Max |
| iPhone SE (2nd and 3rd generation) | Yes | Same chip as the numbered models of its era |
| iPhone 14, 15, 16 (all variants) | Yes | Models sold in the USA from iPhone 14 onwards no longer have a physical tray |
| iPhone purchased in mainland China | No | Uses dual physical SIM instead |
If you bought your phone in Mexico, Colombia, Argentina, Chile, Peru, or the United States, it's usually compatible. The fastest way to confirm it on your own device is to go to Settings > General > About and check if there is a line called "EID": if it's there, your iPhone supports eSIM. You can see the complete list by region in this guide to eSIM compatible phones.
How does eSIM work on iPhone?
Inside, the iPhone has a component called eUICC (the eSIM chip) that can store more than one carrier "profile" at the same time, although only one or two are active depending on the model. When you buy a data plan with eSIM, the provider doesn't send you a card by mail: they send you a QR code or an installation link (called an "LPA" profile) that tells that chip which network to use, with what credentials, and what data settings to apply.
By scanning that code or installing the profile, the iPhone downloads the information, saves it as a new line within Settings > Cellular, and from there, behaves exactly as if it had a physical card inserted: it searches for coverage, connects to the network of the country you're in, and starts transferring data as soon as it detects a signal.
The difference compared to a traditional SIM is that this process is done via software, so you can install it from home, with Wi-Fi, days before your trip, and have the line ready to activate the moment you land. That's what we'll see in the next section.
How to install your travel eSIM on iPhone step-by-step
These are the general steps to install a travel eSIM on a compatible iPhone. The order matters: doing step 1 with Wi-Fi before leaving home saves you the problem of having to install something without a connection upon arrival in another country.
- Purchase the data plan before you travel, while you still have Wi-Fi or data from your local carrier. Most providers send the QR code by email as soon as the purchase is confirmed.
- Open the confirmation email from your iPhone and save or have the QR code or installation link handy.
- Go to Settings > Cellular > Add eSIM (in older iOS versions it appears as "Set up Cellular Data") and choose the option to scan the QR code, or install directly if it came as a link.
- Name the line, for example "Mexico Trip" or "Argentina Data." This is optional but will save you confusion later, especially if you travel frequently.
- In Default Voice Line, select the new eSIM to be the one that uses the internet. If your iPhone also has an active physical SIM, make sure it is marked as the data line, not the other one.
- Activate the eSIM upon arrival at your destination (some providers allow activation beforehand, others wait until you detect the first network in the country). With PuraSIM, for example, you have 180 days from purchase to activate it when it suits you.
If you prefer to see the process with step-by-step screenshots, including installation with a link instead of a QR code, there is a dedicated guide for that: how to install an eSIM.
How to use eSIM and physical SIM simultaneously on your iPhone?
From iPhone XS onwards, the phone supports having two active lines at once: your usual physical SIM (with your local number) and a travel eSIM working in parallel. You don't have to choose one over the other or remove your home SIM to insert the travel one.
What you should decide is what each line does. In Settings > Cellular, you can separately configure the "Default Voice Line" (usually your physical SIM, so you continue to receive calls and SMS to your usual number) and the "Default Data Line" (the eSIM, so all browsing goes through the travel plan). WhatsApp, for its part, continues to work with your usual number regardless of which of the two lines is using data at that moment; if you also want to use it for calls while traveling, this WhatsApp with eSIM guide explains it in detail.
One detail that almost no one checks and that avoids surprises on the statement: go into your physical home SIM line (not the eSIM) and turn off the "Data Roaming" option there. This way, if at any point the eSIM signal weakens, the iPhone won't default to using your local carrier's data in roaming without you realizing it; it simply loses data until it recovers the eSIM signal, which is the behavior you want.
If your iPhone came to you with a carrier lock (for example, financed and not yet unlocked), you may not be able to activate any eSIM from a different provider until the original carrier unlocks it. It's a good idea to check this before purchasing the travel plan, not at the airport.
What are the disadvantages of eSIM?
No technology is perfect for all cases, and being honest about this saves you surprises. These are the real limitations of using eSIM on your iPhone, not just the advantages:
- You cannot physically transfer it to another phone. If your iPhone is lost, broken, or runs out of battery and you need to temporarily use another device, you cannot remove the eSIM and insert it into another phone as you would with a physical card. You would need to regenerate the profile from that other device, if compatible.
- You need an internet connection to install it. The first step (downloading the profile) requires Wi-Fi or data. If you arrive at a destination without any connection and haven't installed it before leaving, you'll have to find an open Wi-Fi network first.
- A carrier-locked iPhone may reject it. As mentioned earlier, if the phone is not unlocked, some carriers prevent the installation of third-party eSIM profiles.
- Changing phones means reinstalling, not transferring with a clip. When buying a new iPhone, you generally have to reactivate your eSIMs on the new device; some providers allow you to resend the code, others do not.
None of these limitations are usually a real problem for a short or medium trip, but it is worth knowing them before relying completely on eSIM as the sole form of connection.
A real trip: what it's like to use eSIM on iPhone in Mexico City
To make all the above stop being theory, imagine this scenario with concrete steps, just as it would happen in practice.
Marina lives in Bogotá and has a flight to Mexico City next week. Two days before traveling, from her home and with Wi-Fi, she buys a data plan for Mexico, receives the QR code by email on her iPhone 13, and installs it following the steps in Section 5. She names the line "CDMX" and sets the default mobile data to that eSIM, leaving her Colombian SIM only for calls and SMS.
On the day of the flight, she puts her phone in airplane mode as usual. Upon landing at Benito Juárez International Airport, she turns off airplane mode: within a few seconds, the eSIM detects the local network and starts providing data, without looking for counters or queuing to buy a physical SIM. She opens Google Maps to locate an authorized taxi, replies to a WhatsApp message from her family (which still goes to her usual number), and checks the hotel she booked, all before leaving the baggage claim area.
During her five-day trip, her Colombian SIM still receives calls if someone dials her, but all her browsing (maps, networks, translation) goes through the Mexico eSIM. She didn't have to ask at any counter what the best local plan was or distrust street vendors near the airport: the decision had already been made before leaving Bogotá.
What to do if the eSIM doesn't connect upon arrival?
Most cases where an eSIM "doesn't work" upon landing are resolved with a quick settings check, not with a real line problem. Before assuming something went wrong, check these in order:
- Confirm that you turned off airplane mode and that at least one or two minutes have passed: the iPhone takes a while to register on a new network.
- Go to Settings > Cellular and verify that the eSIM is marked as the active line for data, not the physical one.
- Check that the eSIM itself is "Activated" (sometimes it's installed but the line number isn't activated, especially if the provider requires manual activation upon arrival).
- Try manually selecting the network in Settings > Cellular > [your eSIM] > Network Selection, temporarily disabling "Automatic" and choosing an operator from the list.
- Restart your iPhone. It sounds obvious, but it solves a good number of cases where the profile is correctly installed but not fully activated.
If it still doesn't work after this, the quickest thing to do is write directly to the provider. In PuraSIM's case, support is available 24/7 in all languages via email and WhatsApp, so you don't depend on office hours to resolve it. There are more frequent cases (and their solutions) in this guide to common eSIM problems.
eSIM vs. Physical SIM vs. Roaming: The Comparison
With these three options on the table for your next trip, this table summarizes how they truly differ, beyond just the name:
| Criterion | Travel eSIM | Local Physical SIM | Roaming from your carrier |
|---|---|---|---|
| When you activate it | Before leaving, from home | Upon arrival, at a store or kiosk | Already active, just turn on data |
| Do you need to go to a counter? | No | Yes, almost always | No |
| Do you keep your usual number? | Yes, on the parallel physical line | No, while you're using it | Yes |
| Cost control | Fixed plan, purchased beforehand | Fixed plan, purchased there | Depends on the original carrier; variable |
| Requires SIM tray | No | Yes | No (uses your current SIM) |
No option is incorrect in all cases: if you're staying for months in a single country, a local physical SIM might be more cost-effective. If your priority is to arrive connected without hassle and keep your number available, eSIM is usually the most practical. The full analysis, with more scenarios and destinations, can be found in eSIM vs. roaming and eSIM vs. physical SIM.
Frequently asked questions
Do I need Wi-Fi to activate the eSIM?
You need an internet connection (Wi-Fi or data) to install the profile for the first time, because the iPhone needs to download it. Once installed, activation at the destination only requires a signal from the country's mobile network, not Wi-Fi.
Can I have multiple eSIMs saved on my iPhone at the same time?
Yes. The iPhone can save several eSIM profiles installed, although only one or two are active at a time depending on the model. You can keep one from a previous trip and add a new one without deleting the first.
Will I lose my WhatsApp number if I use a data eSIM?
No. WhatsApp is linked to your physical SIM number, not to the line you use for browsing. You can use the eSIM only for data and continue to receive messages on your usual number normally.
Does eSIM work as fast as a physical SIM on 4G or 5G?
Yes, the speed depends on the local carrier's network you connect to, not the card type. An eSIM connected to a 5G network browses at the same speed as a physical SIM on that same network.
If I change iPhones, does the eSIM automatically transfer?
Not always automatically. When switching to a new iPhone, you generally need to reinstall the eSIM profile; some providers allow you to resend the QR code free of charge, it's worth checking with whoever sold you the plan.
Can I use an eSIM if my iPhone is locked by a carrier?
It depends on the carrier. Some block the installation of third-party eSIM profiles until you unlock the device. If your iPhone comes from a financed plan, it's a good idea to confirm that it's unlocked before purchasing a travel eSIM.
Do I need to remove my physical SIM to install the eSIM?
No. You can leave your physical SIM where it is and install the eSIM as an additional line. The iPhone handles them as two independent lines that you can configure separately for calls and data.
How long do I have to activate the eSIM after purchasing it?
With PuraSIM, you have 180 days from the date of purchase to activate it, so you can buy it in advance without the pressure of using it immediately.
Conclusion and How to Get Started
Using an eSIM on your iPhone is no more complicated than installing an app: buy it, scan a code, select it as your data line, and you're done. The real difference is when you do it, and the short answer is before you travel, with Wi-Fi, not in the immigration line.
If your iPhone is compatible (most likely if you bought it outside mainland China) and your next destination is among the more than 200 covered by PuraSIM, the next step is to choose your destination's data plan from the international eSIM collection, install it calmly a few days before you leave, and have it ready to activate as soon as you land. And if something doesn't go as expected, 24/7 support is available in all languages via email and WhatsApp, with line activation in about a minute once you turn it on.
