eSIM Not Working? Troubleshooting Guide 2026

If your eSIM is not working, the most common fixes are: enable Data Roaming for the eSIM line, set it as the cellular data line, confirm the APN is correct, and toggle Airplane mode. Most eSIM issues are settings-related, not faults with the eSIM itself.

You landed in a new country, installed your travel eSIM, and now there is no signal, no data, just a "No Service" message. Before you panic, know that the eSIM chip itself is almost never the problem. In the vast majority of cases, one or two settings are switched off.

This guide walks through every common eSIM symptom, what causes it, and exactly how to fix it on both iPhone and Android. Work through it in order and you will be back online in minutes.

Symptom, cause and fix at a glance

Find your exact symptom in the table below, then jump to the matching fix further down. Each row points to the single most likely cause first.

Symptom	Most likely cause	Fastest fix
"No Service" or "Searching..."	Data Roaming is off, or the wrong network is selected	Turn on Data Roaming for the eSIM line, then manually select a network
No data, but signal bars show	eSIM is not set as the cellular data line, or APN is wrong	Set the eSIM as Cellular Data, then check the APN
Stuck on "Activating..." forever	You are not at the destination yet, or weak Wi-Fi during install	Wait until you arrive, or reconnect to strong Wi-Fi and retry
"Unable to Activate eSIM" / "Cannot Add Plan"	Phone is carrier-locked, or the eSIM is already installed	Check carrier lock and look for an existing eSIM profile
"This code is no longer valid"	The QR code has already been scanned once	Check if the eSIM is already installed before re-scanning
Slow speed or frequent drops	Weak local coverage, network congestion, or a VPN interfering	Reselect the network manually and disable any VPN
eSIM disappeared after a software update	Profile was removed or corrupted during the update	Re-download the eSIM from your account or the app

The 60-second fix to try first

This short sequence resolves most eSIM connection problems. Try it before anything more advanced.

Toggle Airplane mode: turn it on, wait 10 seconds, turn it off.
Enable Data Roaming for your eSIM line. Travel eSIMs use a local network abroad, which your phone treats as roaming, so this switch must be on.
Set the eSIM as your data line: open your cellular settings and select the eSIM under Cellular Data (iPhone) or Mobile Data (Android).
Confirm the line is turned on and wait one to two minutes for the network to register.

Still stuck? Work through the ordered diagnostics below.

Step-by-step diagnostics

Follow these steps in order. Most issues are solved by step 3, so do not skip ahead.

Confirm you are in the coverage area. Travel eSIMs only connect inside the countries or regions on your plan. If you have not landed yet, an "Activating..." or "No Service" message is normal.
Turn on Data Roaming for the eSIM line. This is the single most common fix. It will not trigger charges from your home carrier because you are using the travel eSIM's data, not your home plan.
Set the eSIM as the cellular data line. Having the eSIM installed is not enough; it must be selected for data. Pick it under Cellular Data (iPhone) or Mobile Data / SIM Manager (Android).
Restart the phone properly. Power off completely, wait 30 seconds, power on, then wait one to two minutes for network registration.
Select a network manually. Turn off automatic network selection and choose each available operator in turn until one connects. Switch automatic selection back on once connected.
Check the APN. If you have signal but no internet, the APN may be wrong. Most Simbye eSIMs use Auto-APN, so this is rarely the issue, but a manual APN sometimes resolves stubborn cases.
Disable any VPN or content-blocker. VPNs can block both activation and data. Turn them off while troubleshooting and re-enable once the eSIM works.
Reset network settings. This clears saved network configurations and fixes many deep issues. It erases saved Wi-Fi passwords and Bluetooth pairings, but it does not delete your eSIM.
Update the phone software and carrier settings. Apple and Google regularly ship updates that fix eSIM bugs. On iPhone, also accept any prompted carrier-settings update.
Re-download the eSIM as a last resort. If nothing else works, remove and reinstall the profile (see the support section below first).

iPhone vs Android: where the settings live

The fixes are the same, but the menu paths differ. Use the side that matches your phone.

On iPhone (iOS)

Open Settings > Cellular (or Mobile Data).
Under Cellular Plans, tap your eSIM (often labelled "Travel," "Secondary" or "Personal") and make sure Turn On This Line is enabled.
Tap Data Roaming and switch it on.
Go back, tap Cellular Data at the top, and select the eSIM.
For network selection: tap the eSIM, open Network Selection, turn off Automatic, and pick an operator.
For the APN: tap the eSIM, open Cellular Data Network, and enter the APN your provider gave you. If that option is missing, your eSIM uses Auto-APN and this is not your problem.

On Android (Samsung and Pixel)

Samsung: open Settings > Connections > SIM Manager. Pixel: open Settings > Network & Internet > SIMs.
Select your eSIM and make sure it is enabled, then choose it for Mobile Data.
Enable Data Roaming under Mobile Networks (Samsung) or directly under the SIM (Pixel).
For network selection: open Mobile Networks > Network Operators, turn off Select Automatically, and pick an operator.
For the APN: open Mobile Networks > Access Point Names, add a new APN with the value from your provider, leave the other fields blank, save it, and select it.

When to contact Simbye support

If you have worked through every diagnostic step and you are inside the coverage area, it is time to reach a human. Contact Simbye support before deleting your eSIM, because removing it may require a replacement profile.

Simbye offers 24/7 human support in 12 languages via WhatsApp, Telegram and live chat, with real agents rather than chatbots. The team can confirm your coverage, check your account, push a fresh profile to your line, or issue a replacement activation code on the spot.

If your eSIM was removed during a software update or you lost the original QR code, the quickest path is to re-download it. You can do this in seconds from the Simbye app or from your eSIM account page, where you can view the QR code again, check your remaining data and top up if needed.

Get a Simbye eSIM that just works

A reliable eSIM with responsive support prevents most of these headaches in the first place. Simbye delivers your QR code instantly, uses Auto-APN so there is little to configure, and backs every plan with round-the-clock human help across 190+ destinations.

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Frequently asked questions

Why does my eSIM show "Activating" but never connect?

If you have not reached your destination, this is normal because a travel eSIM only activates on a local network inside its coverage area. If you are already there, toggle Airplane mode, enable Data Roaming, select a network manually and restart the phone.

Why do I have signal bars but no internet on my eSIM?

This usually means the eSIM is not set as your cellular data line, or the APN is wrong. Select the eSIM under Cellular Data, and if you still have no internet, enter the APN your provider supplied. Most Simbye eSIMs use Auto-APN, so a manual APN is only needed in rare cases.

Will resetting network settings delete my eSIM?

No. Resetting network settings on iPhone or Android clears saved Wi-Fi passwords and Bluetooth pairings, but your eSIM profile stays installed. It is a safe step to try when a connection will not come back.

My eSIM worked yesterday but stopped today. What changed?

The usual causes are a used-up data balance, leaving the coverage area, a software update that reset a setting, or a temporary local outage. Check your remaining data, confirm you are still in a covered region, and make sure Data Roaming is still on.

Why does "This code is no longer valid" appear when I scan my QR code?

Each eSIM QR code can only be scanned once, even if you cancelled the install partway through. First check whether the eSIM is already in your cellular settings. If it is not there, contact Simbye support and a replacement code can be issued instantly via chat.

Can I use my eSIM and physical SIM at the same time?

Yes. Most modern phones support dual SIM, so you can keep your physical SIM for calls and texts while the eSIM handles data. Just remember to select the eSIM for Cellular Data in your settings.

Can a VPN cause my eSIM to stop working?

Yes. A VPN can block both eSIM activation and ongoing data. Disable any VPN or content-blocker while you set up the eSIM and while troubleshooting, then re-enable it once the connection is stable.

What should I do if none of these fixes work?

Contact your provider. Simbye support is available 24/7 via WhatsApp, Telegram and live chat, in 12 languages. The team can verify coverage, refresh your eSIM profile remotely, or send a replacement activation code so you can get back online.

Why Is My eSIM Not Working? Complete Troubleshooting Guide 2026