In short: You only need to configure an eSIM's APN if, after activating it and having a signal, you don't have internet: go to the mobile data settings for that line, enter the exact APN provided by your carrier, and restart the connection. On an iPhone, it's under Mobile Data → Mobile Data Network; on Android, it's under Mobile Networks → Access Point Names. It takes less than two minutes.
Most travel eSIMs work automatically as soon as you activate them, but occasionally you need to manually enter the APN for them to connect to the internet. Knowing how to configure an eSIM's APN can save you from a predicament when you have the card installed but no internet. In this guide, you'll learn what an APN is, when it needs to be adjusted, and the exact step-by-step process for iPhone and Android, without jargon.
What is an APN and what is it for?
APN (Access Point Name) is the name of the access point that tells your phone how to connect to the internet via the operator's network. Without the correct APN, you'll have coverage and signal, but your data won't work. It's like having a house door but no key to open it.
Each operator has its own APN, a small configuration with a name (sometimes also a username and password) that the phone uses to route your data. Normally, the APN configures itself when you install an eSIM: the profile you scan already contains the settings. That's why most people never hear about APNs. It only comes into play when something goes wrong and the eSIM, despite being installed and having a signal, doesn't provide internet. In that case, entering the correct APN manually usually fixes it quickly.
Do I need to configure my eSIM's APN?
In most cases, no. Modern travel eSIMs come with the APN pre-configured and connect automatically as soon as you activate them. You'll only need to adjust it if the eSIM is installed, has a signal, but can't connect to the internet even with data activated.
Before you dive into the APN, rule out the basics, which solve most failures: check that you've selected the eSIM as your data line, that data roaming is activated for that plan, and that the plan is actually active (not expired or out of GB). Often the problem isn't the APN, but one of these settings. If everything is correct and you still can't connect, then it's time to check the APN. If you're not sure what exactly "data roaming" is and how it differs from your usual operator's roaming, we explain it simply in what is data roaming, and if you're wondering how it differs from your traditional Spanish operator's roaming, the eSIM vs roaming comparison answers that question.
And be careful with one specific case: if you're going for a short weekend to an EU country where your Spanish plan already includes roaming at no extra cost, you don't need to activate any eSIM or touch any APN, so don't buy anything yet. Save the eSIM for longer trips, outside the EU, or to destinations where your operator's roaming is expensive or non-existent.
Golden rule: don't touch the APN first. First, check that the eSIM is your data line and that roaming is activated. Only adjust the APN if those are already fine and you still don't have internet.
Configuring the APN on iPhone step by step
On an iPhone, the APN is located within each line's mobile data settings. The process is quick and won't delete any other settings. Do this with the eSIM selected as your data line.
- Open Settings and go to Mobile Data (or Cellular).
- Tap the travel eSIM in the list of lines.
- Go to Mobile Data Network.
- In the APN field under the "Mobile Data" section, enter the APN provided by your carrier.
- Leave username and password blank unless otherwise instructed.
- Exit Settings, then toggle airplane mode on and off for a few seconds to apply the changes.
If you don't see the "Mobile Data Network" option, it's usually because that line doesn't allow editing; for a travel eSIM, it's almost always available. One detail often overlooked: on some iPhones, the APN change isn't applied with airplane mode alone; a full device restart is needed for it to take effect. If you're still unclear about what an eSIM is and how it differs from a physical SIM, we explain it in what is a virtual eSIM.
Configuring the APN on Android step by step
On Android, the path varies slightly depending on the brand (Samsung, Xiaomi, Google Pixel), but the idea is the same: enter the eSIM's settings and edit or create a new APN. Here you can have several APNs saved and choose which one to use.
- Open Settings and go to Connections or Network & internet.
- Enter Mobile networks or SIMs and select the travel eSIM.
- Look for Access Point Names (APN).
- Tap the + symbol to add a new APN (or edit the existing one).
- Enter the Name (anything) and the APN provided by your carrier; leave the rest as default.
- Save using the three dots → Save and select that APN as active.
Restart mobile data or airplane mode for the changes to take effect.
Where to find the menu by brand
The exact name of the menu varies significantly from one manufacturer to another, and this is where most people get lost:
- Samsung: Settings → Connections → Mobile networks → Access Point Names. If you have two SIMs, make sure you are editing the eSIM's APN and not your physical line's.
- Xiaomi (MIUI/HyperOS): The menu is usually hidden under Settings → SIM cards & mobile networks → tap the eSIM → More SIM settings → Access Point Names (APN). In some MIUI versions, you need to deactivate "VoLTE mode" first to enable editing the field.
- Google Pixel (pure Android): Settings → Network & internet → SIMs → select the eSIM → Access Point Names. This is the most straightforward flow of the three.
A common Android mistake: having an APN saved from a previous trip with another provider and the phone continues to use that one instead of the new one. Delete old APNs you no longer use instead of letting them accumulate; this prevents the system from choosing the wrong one. If you haven't installed the eSIM yet and want the complete step-by-step before getting here, the guide on how to install an eSIM covers it for iPhone and Android.
What information to put in the APN
The only essential piece of information is the APN name, which your eSIM provider will give you (you'll find it in the purchase email or the plan instructions). Username, password, and the rest of the fields are almost always left blank or as default.
This table summarizes what to fill in and what not to for a typical travel eSIM APN:
| Field | What to enter | Required |
|---|---|---|
| Name | Anything you want (e.g., "Travel") | Yes (internal label) |
| APN | As indicated by your provider | Yes |
| Username | Blank | No |
| Password | Blank | No |
| APN type | default,supl (if requested) | Usually not |
If your provider hasn't given you a specific APN, it means the eSIM should work on its own: in that case, don't configure it manually and check your data settings instead. PuraSIM offers 24/7 support in all languages via email and WhatsApp, so you can always ask for the exact APN for your plan before touching anything.
eSIM still not connecting: what to check
If you've entered the correct APN and still have no internet, the problem is almost never the APN itself, but another setting or the plan status. Review this list before assuming the eSIM is broken.
- Data line: confirm that the eSIM is selected for data, not your Spanish SIM.
- Data roaming: it must be activated for the eSIM (even if they call it roaming, it's necessary here).
- Active plan: ensure it's not expired or out of GB.
- Coverage: check that you are in a country covered by the plan.
- Restart: turn your phone off and on; sometimes that's all it takes.
Coverage deserves a separate paragraph because it is not always uniform within the same country. In destinations like South Korea, in cities like Seoul or Busan the network is excellent, but in remote mountain areas or natural parks it can become intermittent even if the plan is perfect and the APN is correctly set; there, the problem is not your configuration, but the country's network itself. Before spending more time on the APN, check your plan's coverage map to see if the exact area where you are has service.
If, after all this, you still have no connection, also check that you don't have your Spanish physical SIM's roaming active at the same time: some phones incorrectly prioritize between the two lines and confuse the data connection, so it's advisable to deactivate data for the Spanish line while using the eSIM.
APN myths that almost no one tells you
There are several misconceptions circulating about APNs that cause people to waste time. Here are the ones we see repeated most often.
"I need a different APN for every country I visit." False, and this is the most common underlying error. Your eSIM works via roaming to your provider's network, not to the local operator in the country; the APN is always the same, the one your eSIM provider gives you, whether you travel to Portugal, Korea, or anywhere else. If someone tells you to look for "the APN for that country," be suspicious.
"If I touch the APN and make a mistake, the eSIM will break." Also false. The APN is just a connection setting; it's not part of the eSIM profile itself. You can delete it, change it, or leave it blank as many times as you want without damaging anything; in the worst case, you simply won't have internet until you correct it.
"If I have dual SIM, it's better to also carry a spare physical SIM in case the eSIM fails." For almost any trip, it's not necessary, and it adds another APN to manage. If you have doubts about the real difference between carrying a spare physical chip or relying solely on an eSIM, in international chip vs eSIM we compare them in detail.
Another detail almost no one mentions: data consumption also influences how the connection behaves, even if the APN is perfect. If you notice that you're running out of GB faster than expected and suspect the problem isn't the APN but background app consumption, in how to save data with your travel eSIM you'll find specific tricks to extend your plan without touching any technical settings.
Frequently asked questions
Do all eSIMs require manual APN configuration?
No. The vast majority of travel eSIMs come with the APN pre-configured in the profile you install and connect automatically. You'll only need to enter it manually if the eSIM is activated and has a signal but cannot connect to the internet after checking basic settings.
Does configuring the APN erase my data or apps?
No. Changing the APN only affects how that line connects to the internet; it does not delete photos, apps, or your other SIM. If you make a mistake, you can edit it again or delete that APN and start over without any risk to the rest of your phone.
Where do I find my eSIM's APN?
In the purchase email or the plan instructions sent by your provider. If no APN appears, it usually means the eSIM works automatically. PuraSIM offers 24/7 support in all languages via email and WhatsApp, so you can ask for the exact APN for your plan before configuring it.
Does the APN change depending on the country I'm traveling to?
No. The APN depends on your eSIM provider, not the country you are in. Since the connection works via roaming to your provider's network, the same APN works whether you are in Lisbon or Bangkok. You would only need to change it if you contract an eSIM from a different provider.
I have two eSIMs or one eSIM and one physical SIM, can they interfere with each other?
Yes, it's more common than it seems. If your Spanish SIM has roaming activated at the same time you're using the travel eSIM, your phone might incorrectly prioritize which one it uses for data and cause connection problems even if the APN is correctly set. Deactivate mobile data for the line you won't be using.
I entered the APN but still have no internet, what do I do?
Almost always, it's not the APN. Check that the eSIM is your data line, that data roaming is activated, that the plan is valid and has GB, and restart your phone. If it still fails, contact your provider's support.
Is the APN the same on iPhone as on Android?
The APN data is the same; where it's entered changes. On iPhone, it's under Mobile Data → Mobile Data Network; on Android, it's under Mobile Networks → Access Point Names (APN). On Android, you can save multiple APNs and choose which one to use.
Conclusion
Configuring an eSIM's APN is only necessary in rare cases, and when it is, it's a matter of a couple of minutes: you go into the data settings, enter your provider's APN, and restart the connection. Before touching it, always rule out basic settings, which resolve most failures, and remember that the APN is the same no matter where you travel. Choose an easy-to-configure eSIM from our store, for example, the eSIM for Europe if you're traveling within the continent, and stay connected without technical complications.
