In short: if your eSIM doesn't work when you land, the plan is almost never the reason: it's that your phone doesn't know it should be using it yet. Enable data roaming on the eSIM line, set it as the primary data line, and restart your phone. With these three settings, it connects in seconds in the vast majority of cases.
You've just landed, you turn off airplane mode and... nothing: no data. If your eSIM doesn't work when you land, it can almost always be fixed in a couple of minutes by adjusting three settings. In this guide, you'll go step-by-step, from the quickest solution to the least common, to get back online without stress at a foreign airport.
Quick 3-step solution
In the vast majority of cases, the eSIM doesn't connect upon landing due to a setting, not a plan failure. Do this in order: enable data roaming on the eSIM line, set it as the primary data line, and restart your phone. This usually connects it in seconds.
Before touching anything, breathe: your plan is fine and your data is still there. Most likely, your phone doesn't yet know it should use the eSIM on the new country's network. This table summarizes the most typical symptoms and their direct fix:
| Symptom | Probable cause | Solution |
|---|---|---|
| Coverage but no internet | Roaming disabled | Enable roaming on eSIM |
| No signal bars | Network not selected | Restart or manually select network |
| Data via Spanish SIM | Incorrect data line setting | Set eSIM as data line |
| "eSIM installed" in gray | Profile not activated | Activate it or check APN |
In practice, the first or second fix is almost always enough. If you're browsing after those three basic adjustments, perfect. If not, keep reading: below we break down each one and less common solutions. And if you want to understand exactly what each thing is first, here we explain the difference between eSIM and roaming, which is precisely the confusion that causes most of these disconnections upon landing.
Enable data roaming
This is one of the most common causes. Even if the eSIM is for the country you've traveled to, technically your phone is "roaming" relative to your home configuration, and many phones have this option disabled by default to avoid roaming bill shock.
Data roaming allows the eSIM to connect to local antennas at your destination. Without it activated, you'll see the network but won't have internet. Activate it like this, specifically on the eSIM line (not on your Spanish SIM):
- iPhone: Settings > Cellular > tap the eSIM line > enable "Data Roaming."
- Android: Settings > Connections (or Network & Internet) > Mobile networks > select the eSIM > enable "Data Roaming."
Note: Activating roaming on your travel eSIM is safe and does not incur extra charges, because you paid for the plan upfront. What you should avoid is leaving roaming activated on your Spanish SIM, which can incur expensive roaming charges.
If you want to understand exactly what this setting does and why it doesn't incur extra cost on your travel eSIM, we explain it in detail in what is data roaming.
Choose the eSIM as the data line
Another common mistake: your phone keeps trying to use your Spanish SIM for data instead of the eSIM. Since you have dual SIM, you have to explicitly tell it which one uses internet at the destination, or it won't connect to the correct network.
Go to your mobile data settings and, where it says "Mobile Data" or "Default Data Line," select your travel eSIM. While you're at it, disable data on your Spanish SIM to avoid accidentally using your operator's roaming. The change is instant and doesn't erase anything.
Take the opportunity to check that the eSIM is activated (not just installed): in the list of lines, it should appear as on, not grayed out. If it appears installed but without a signal, it's a good idea to review how to install it correctly from the beginning: you can find the step-by-step instructions in how to install an eSIM. And if you have doubts about what exactly that profile you just scanned is and why it doesn't behave like a physical SIM, we clarify the concept in what is a virtual eSIM.
Restart and manually select network
If roaming and the data line are configured correctly but you still have no connection, restart your phone. When it boots up, the phone searches for networks from scratch and usually latches onto the country's network. It's the most boring trick, yet it solves many cases.
If it still doesn't work after restarting, try to manually select the network. By default, the phone chooses the network "automatically", but sometimes it gets stuck searching. Force the search like this:
- Go to Settings > Cellular > eSIM line > "Network Selection."
- Disable the "Automatic" option.
- Wait for the list of local operators in the country to appear.
- Choose a major one (you'll see them with local names) and wait a few seconds.
Try one; if it doesn't connect, go back and try another. This method unblocks the classic "I have coverage but no internet" issue. If the problem is that there's no signal from any operator directly, it's usually a matter of location (basements, parking lots, airport metal structures) rather than the eSIM itself: go to an open area and try again.
Check APN
The APN is the setting that tells your phone how to connect to the internet over the mobile network. Normally, it configures itself, but on some Android models, you have to enter it manually for the eSIM to work. If you've gotten this far without success, this is the next thing to check.
You'll find the correct APN in your eSIM purchase email or the provider's instructions. To enter it, go to Settings > Mobile Data > eSIM line > "Mobile Network" > "Access Point Names (APN)" and add the one provided. On iPhones, it's rarely necessary to touch it; on Android, the APN is often the missing piece, especially on Chinese models with aggressive customization layers that "clear" the APN upon reboot.
After saving the APN, restart once more. With the correct APN and roaming activated, the connection should appear. If data still doesn't load, calmly re-check roaming and the data line: in more than one case, the real problem was still one of those first two steps, not the APN.
When to contact support
If you've tried roaming, data line, restart, manual network selection, and APN, and you still don't have internet, it's time to contact support. A good eSIM provider offers support in Spanish and can check if your plan was activated correctly or resend your profile. Don't spend hours struggling alone.
Before writing, have this information handy so they can help you quickly: phone model and operating system, country you are in, whether you see the network in settings, and what steps you have already tried. With that, support usually identifies the problem in the first response.
Tip while you wait: connect to the airport or a cafe's Wi-Fi to chat with support and check maps. This way, you solve the problem without being incommunicado upon arrival in a foreign country.
Remember that many problems can be avoided by installing the eSIM at home in advance, with Wi-Fi, and not upon landing with limited data or no connection. If your next destination is Europe, keep in mind that roaming between EU countries with our Europe eSIM works the same way as explained above: it's activated once and travels with you through all the countries included in the plan, without having to reconfigure anything when crossing each border.
Errors and tricks almost no one tells you about
Beyond the five steps above, there are a number of small details that explain quite a few strange cases. None of them are mysteries, but they also don't appear in any manufacturer's standard instructions.
- iPhone's "Automatic Data Switching" puts you back on your Spanish SIM without warning. In Settings > Cellular there's an option called "Automatic Data Switching" which, if you have your physical home SIM activated as a backup, automatically switches to that line as soon as the eSIM loses coverage for a second. Result: you've done everything right and you're still browsing (and incurring roaming charges) with your Spanish operator without knowing it. Disable it as soon as you land.
- A poorly set network mode simulates a "no service" that isn't really there. If on Android you have "4G Only" or "3G Only" manually forced in network preferences and the local operator your eSIM has connected to doesn't have that band deployed in that area, you'll see zero bars even if roaming is perfect. Set the preference to automatic (2G/3G/4G/5G) and let the phone choose.
- Turning airplane mode on and off is not the same as restarting. The airplane mode trick refreshes the signal, but it doesn't always re-read the eSIM profile from scratch as a full restart does. If you've tried airplane mode two or three times without success, don't insist: restart directly.
- An active VPN can prevent the phone from detecting the new APN correctly. If you usually travel with VPN enabled for privacy, activate it only after confirming that the eSIM already has data, not before: some phones do not complete registration on the local network with a VPN tunnel active from the first second. If this is your case, we have specific tips on how to use VPN without breaking the eSIM connection.
- Airport Wi-Fi may require an SMS that your data line cannot receive. Many travel eSIMs are data-only, without their own voice number or SMS. If the free airport Wi-Fi requires SMS verification, you won't receive anything via the eSIM: only use Wi-Fi if it doesn't require verification, or stick with your mobile data until you reach the hotel.
- In Seoul and Busan, let your phone try more than one operator. Automatic selection sometimes gets stuck in a loop between SKT, KT, and LG U+ as soon as you land in Incheon. If it still doesn't connect after a minute, force manual selection as explained above: in South Korea, it usually resolves on the first try. More coverage details by city in our guide to eSIM for South Korea.
- At El Dorado (Bogota), the building structure delays the initial connection. This airport has a lot of metal coverage in the arrivals areas; if you don't connect in the first minute after getting off the plane, walk towards the exit gates or areas with more windows before giving up. We review more specific cases in the guide to eSIM for Colombia.
And an honest truth that also needs to be said: if you are going to spend a short weekend in a European Union country and your Spanish plan already includes free roaming in the EU (most have included it for years), you probably don't need to activate anything new. First, check the conditions of your usual operator; a travel eSIM makes sense when you are going to be outside the EU for several days, when your plan doesn't include roaming, or when you need more data than what is included.
Frequently Asked Questions
Why does my eSIM have coverage but no internet?
This is usually because data roaming is disabled on the eSIM line, or because your phone is using your Spanish SIM for data instead of the eSIM. Activate roaming on the eSIM, set it as the data line, and restart: this resolves most of these cases in a couple of minutes.
Do I have to activate the eSIM before landing?
It's not mandatory, but it's advisable to install it at home with Wi-Fi. What you do upon landing is "turn it on": disable airplane mode, activate roaming on its line, and select it for data. The installation (scanning the QR) is best done beforehand, as it requires Wi-Fi.
Does restarting the phone delete the eSIM?
No. Restarting your phone does not delete the eSIM or its data; it simply causes it to search for networks again when it starts up, which often resolves the lack of connection. You can restart as many times as you want without fear of losing the plan or having to reinstall it.
What if no network appears in the manual selection?
You might be in an area with poor coverage (a basement, a parking lot) or the phone might still be searching. Move to an open area of the airport, wait a minute, and try again. If no local network appears, restart, and if the problem persists, contact support.
Can it fail if the phone is carrier-locked?
Yes. If your phone is locked to a Spanish carrier (not "unlocked"), it may reject the travel eSIM. Make sure your phone is unlocked before traveling. If you bought the phone on an installment plan with a company, it might still be locked until you finish paying for it.
How long does it usually take to regain connection after landing?
With roaming activated and the eSIM set as the data line, it usually connects within seconds or, at most, one or two minutes while the phone registers on the local network. If more than five minutes pass without a signal after trying roaming, data line, and a restart, move directly to checking the APN or contacting support: continuing to wait without changing anything rarely solves anything.
Why did my eSIM work in another country but not this one?
Because each country has its own local operators with whom your plan has agreements, and your phone doesn't always automatically choose the same one. It's common for it to connect automatically in one country and get stuck on "automatic selection" in the next: that's where manually selecting the network comes into play, as we explained above.
Conclusion
If your eSIM doesn't connect when you land, it's almost never a plan failure: it's a setting. Enable roaming on its line, set it as data, restart, and if necessary, check manual network and APN. With these steps, you'll regain internet in minutes. Install your eSIM before traveling and arrive connected to avoid surprises on your next arrival.
