In short: if your installed eSIM with no data appears active but you can't browse, it's almost never a card malfunction: most cases are resolved by checking the APN, enabling data roaming, and ensuring the eSIM is set as the default data line. With these three adjustments, you can usually restore connection in less than ten minutes, without calling anyone.
Why does your eSIM show no data even though it's installed?
Properly installing an eSIM and having a data connection are two different things, and that's where the fundamental confusion lies. The profile downloads, appears as "active" in the settings, even displays the operator's name in the status bar... yet the browser keeps loading. This happens because activating the profile is only the first step: the phone still needs to know how to route that traffic, and that depends on settings that the operating system doesn't always configure automatically.
The most frequent causes, from most to least common, are:
- Incorrect or unconfigured APN: The Access Point Name (APN) is the gateway that connects your mobile to the operator's data network. Without the correct APN, the phone doesn't know where to route traffic, even with perfect coverage.
- Data roaming disabled: If your eSIM operates in roaming mode—as is the case with most international travel eSIMs—your device's roaming setting must be explicitly turned on. It's off by default on almost all phones.
- eSIM not set as data line: On dual SIM phones (physical + eSIM, or two eSIMs), it's easy for the default data line to remain the other card, even if you "selected" the eSIM during installation.
- Problem with the operator's activation process: Less frequent, but it happens: the profile downloads without errors, but the operator hasn't finished activating it in their system yet.
- Airplane mode active or connectivity bug: A residual airplane mode state, or recent network change, can block the connection even with the eSIM active and roaming enabled.
Let's review each in order, starting with the quickest to check.
Quick table: symptom → cause → solution
If you're in a hurry (for example, you've just landed and need to order a taxi), this table saves you time: identify your exact symptom and go straight to the solution.
| What you see on your phone | Most likely cause | What to do |
|---|---|---|
| Network icon visible, but no app loads | APN misconfigured or absent | Enter the APN manually (see next section) |
| Foreign operator name appears, but "No data service" | Data roaming deactivated | Activate "Data Roaming" in eSIM settings |
| Hotel/airport Wi-Fi works, but mobile data doesn't | Default data line incorrectly assigned (dual SIM) | Set the eSIM as the primary mobile data line |
| Everything seems correct but no connection from minute one | Activation pending by the operator | Wait and check again in a while; if it persists, contact support |
| It was working and stopped after moving zone or country | Manual network selection locked to a specific tower | Change network selection to "Automatic" |
| Stops loading after a while, although the icon is still active | Network bug after cell change or stuck airplane mode | Airplane mode for 30 seconds, or complete restart |
Verify APN settings
The APN is the first place to look. Many eSIM providers configure it automatically upon profile installation, but on some devices—especially Android, and particularly on Chinese or refurbished models with modified ROMs—it needs to be entered manually.
On iPhone (iOS)
- Go to Settings → Cellular → Cellular Data Network.
- Select the travel eSIM if you have dual SIM.
- In the APN field under "Cellular Data," enter the value provided by your carrier.
- Close the settings and wait 15 seconds before checking if anything loads.
On Android
- Go to Settings → Connections (or Network) → Mobile Networks → Access Point Names (APN).
- If the eSIM hasn't created an APN automatically, tap the "+" button to add a new one.
- Enter the name, APN, username, and password according to your provider's instructions.
- Save and select the newly created APN by tapping the circle next to its name.
If you can't find your operator's APN, look for it in the confirmation email you received when purchasing the eSIM or on their website's support section. If you installed the eSIM following our step-by-step installation guide, the email with that data is the same one you used to scan the QR.
Activate data roaming
This is the most common error and also the easiest to solve. Many travelers install the eSIM without problems, but forget that the operating system has a data roaming protection disabled by default, precisely to avoid surprise bills with their home operator's rate.
On iPhone
- Go to Settings → Cellular.
- Select the eSIM line.
- Turn on "Data Roaming".
On Android
- Go to Settings → Connections → Mobile Networks.
- Select the SIM corresponding to your eSIM.
- Activate "Data Roaming" or "Roaming", depending on the manufacturer.
Important: If your eSIM is from a local operator in the country you are in (for example, you bought a Japanese eSIM to use in Japan), you do not need to activate roaming: you are already connecting to a domestic network for that card. This setting is only necessary when the eSIM operates in roaming on foreign networks. If this distinction is confusing, we explain it in detail in what data roaming is and also in eSIM vs. traditional roaming, where it becomes clear why a travel eSIM is not the same as activating roaming with your Spanish operator.
Restart network
Sometimes the device remains in an inconsistent state: it detects the network, even shows coverage bars, but doesn't quite establish the data session. This happens a lot right after landing, when the mobile tries to connect to the first antenna it finds while still having its home country's network active. Here are the steps to force a clean reconnection, from least to most aggressive:
Airplane mode
Activate airplane mode, wait 30 seconds, and deactivate it. This forces the mobile to search for a network from scratch. It's the fastest method and, although it seems too simple, it solves most cases of "I have coverage but no data."
Complete restart
Turn off the phone completely (not a quick restart) and turn it back on. On some models, this releases blocked network processes that a simple airplane mode cannot release.
Reset network settings (last resort)
If the above doesn't work, you can reset the device's network settings:
- iPhone: Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings.
- Android: Settings → General management → Reset → Reset network settings.
Warning: this will delete saved Wi-Fi networks and manually configured APNs. You will have to re-enter them, including your home Wi-Fi when you return.
When the problem lies with the operator
If you've checked the APN, activated roaming, restarted the device, and the eSIM still isn't providing data, the problem might be on the operator's side, not the phone's. This occurs in these scenarios:
- Pending activation: Some operators need a while—and in specific cases, several hours—to activate the profile in their system, even if the download was instantaneous.
- Data plan exhausted or expired: Check in the provider's app or website that your data allowance is still valid and hasn't already been consumed, for example, if the timer started running upon installation instead of upon first connecting to the network.
- Insufficient coverage in that specific area: Although rare, you might be in an area without coverage from the operator associated with your eSIM, even if another operator in the same country does have a signal there. Consult the provider's coverage map.
- Temporary network restriction: In some countries, the network your eSIM connects to might be congested during peak hours or experience occasional throttling.
In any of these cases, the solution involves contacting the provider's support. At PuraSIM, for example, support is available 24/7 via email and WhatsApp in all languages, so you can write as soon as you detect the problem without waiting for an office to open. To better understand the differences compared to other travel connection alternatives, also check out international chip vs. eSIM.
What almost no one tells you
Beyond the standard steps, there are a number of technical details that rarely appear in generic guides and explain many cases of "I've tried everything and it still doesn't work":
- The APN protocol might be incorrectly selected, not just the APN itself. On Android, within the advanced APN configuration, there is an "APN Protocol" field (and another for roaming) which is usually set to IPv4 by default. If your operator requires IPv4/IPv6, changing it there solves cases that basic configuration doesn't fix.
- Having two eSIMs (or eSIM + physical SIM) active at the same time confuses the system, not just you. The phone can show both lines as "active" and yet only one is actually providing data. It's not enough to see the green icon: explicitly enter the "Default mobile data line" selector and confirm which one it is.
- Low Power Mode blocks background data. On iPhone, Low Power Mode can limit background network activity. If the browser isn't loading but WhatsApp messages are received with a delay, try temporarily deactivating it.
- An enterprise Device Management (MDM) profile can block roaming even if you activate it. If the mobile is corporate, there are IT policies that prevent roaming data by default, without notifying you. This is more common than it seems on business trips.
- The hotel or airport captive Wi-Fi interferes with mobile data detection. If the phone remains "hooked" to a captive portal that requires login and you don't complete it, some systems delay the attempt at mobile data. Forget that Wi-Fi network or disconnect from it before trying the eSIM.
- Manual network selection gets "stuck" to a specific tower. If you ever manually selected an operator (for example, to force coverage in an area), the phone might keep trying that same network when you move cities. Switch network selection back to "Automatic."
None of these adjustments are intuitively obvious, which is why they generate more support tickets than one would expect for a problem that is, at its core, one of configuration rather than the eSIM card itself.
How to avoid this on your next trip
If you want to reduce the likelihood of encountering this problem on your next trip, the key is to choose the right provider from the start. Not all eSIMs behave the same way: some configure the APN automatically without you having to touch anything, others leave you with just a PDF and a QR.
Criteria that truly make a difference when choosing a travel eSIM:
- Automatic APN configuration: The provider should handle this without you having to delve into advanced Android settings.
- Accessible support before and during the trip: Via email or WhatsApp, available outside of office hours, which is when problems truly arise (upon landing, at night, on weekends).
- Verified compatibility with your device: Check the list of compatible models before purchasing; not all phones with eSIM support multiple profiles in the same way.
- Broad catalog of destinations: If you travel frequently to different countries, having more than 200 destinations available from the same provider avoids having to learn a new process each time.
That said, we have to be honest: if you're going to the European Union and your Spanish tariff already includes data roaming in the EU at no additional cost, you don't need to buy or install any of this—that's your operator's normal roaming, not a travel eSIM, and activating "Data Roaming" on your usual physical SIM card will already work for you. This guide applies if you want network where your tariff doesn't reach: outside the EU, with an additional eSIM like Europe eSIM, USA eSIM or, if you need two active lines within Spain for work or internal travel, an Spain eSIM.
And to maximize the data allowance you purchase, whatever the destination, this guide on how to save data with eSIM while traveling has tips that really make a difference in daily consumption.
Frequently asked questions
Why does my eSIM say it's active but I have no internet connection?
Most commonly, the APN is not configured correctly or data roaming is deactivated in your phone's settings. Check both before contacting the operator; these two explain the vast majority of cases.
Do I need to activate roaming even if I'm traveling with a local eSIM for the country?
It depends. If the eSIM is from a local operator in the country you are in, you don't need roaming: for that card, you are a domestic customer. But if it is an international eSIM that operates in roaming, you must activate it in your device's settings.
How do I know the correct APN for my eSIM?
Your eSIM provider should indicate the APN in the confirmation email or on their support website. If you can't find it, contact their customer service; do not try to guess it with a generic APN from the internet, as this usually causes more problems than leaving it blank.
Does restarting the phone solve the no-data eSIM problem?
Sometimes it does. A complete restart forces the device to reconnect to the operator's network from scratch. Before going to that extreme, try activating and deactivating airplane mode for 30 seconds: it resolves a significant portion of cases with much less effort.
How long can an eSIM take to activate after installation?
In most cases, as soon as you install the profile and activate roaming, you have data. But with some operators, activation in their system can take a while, and in specific cases, several hours. If you've just bought it and haven't been trying for even five minutes, give it some leeway before assuming something is wrong.
Why do I have Wi-Fi at the hotel but my eSIM's mobile data isn't working?
Because they are independent connections: working Wi-Fi says nothing about the status of your eSIM's roaming. Check that the eSIM is selected as the default mobile data line and that roaming is active; the hotel's Wi-Fi does not replace or "fix" that configuration.
What do I do if no solution works?
Contact your eSIM provider's support directly. They can verify from their end if the profile is correctly activated and if there is coverage in your area; this is information you cannot access from your phone.
