You installed the eSIM, went through the whole process, and it looked like everything worked. Then you look at the top of your screen and there's nothing — no carrier name, no signal bars, just "No Service" or "No SIM." The profile is there in your settings, but it's not doing anything.
This is one of the most common complaints people have after eSIM installation, and it's almost always solvable without needing a new plan or contacting support. The installation problem and the signal problem are separate: installation puts the profile on your device, but a handful of configuration steps are needed before your phone actually connects to the network.
This guide works through the causes systematically, from the most common to the edge cases, so you can get to the actual fix without spending an hour guessing.
First: Confirm the Profile Is Actually Installed
Before troubleshooting signal, confirm the eSIM profile is genuinely present on your device. On iPhone, go to Settings → Cellular and look for the eSIM in the list of plans. On Android, go to Settings → Connections → SIM card manager (or equivalent) and check for your eSIM entry.
If the profile isn't listed at all, the installation didn't complete. That's an installation issue, not a signal issue — revisit the installation process or try the manual installation method as an alternative.
If the profile is listed but shows "No Service" or a grayed-out status, read on.
The Most Likely Reason: eSIM Is Not Enabled or Set as Data
This is the cause of the vast majority of "no signal" reports after eSIM installation. The profile was added, but the phone hasn't been told to actually use it. There are two separate switches to check:
Is the eSIM line turned on?
On iPhone: Settings → Cellular → tap the eSIM plan name → make sure "Turn On This Line" is toggled on. This is easy to miss because the toggle defaults to off on some iOS versions when you first add an eSIM.
On Android (Samsung): Settings → Connections → SIM card manager → tap the eSIM → ensure it's enabled. On Pixel: Settings → Network & internet → SIMs → tap the eSIM → toggle it active.
Is data roaming enabled?
Travel eSIMs almost universally require data roaming to be enabled, even though you're not "roaming" in the traditional sense — the eSIM technically connects as a visiting subscriber on the local network. If data roaming is off on the eSIM line, you'll have a registered signal but data won't flow.
On iPhone: Settings → Cellular → tap the eSIM plan → enable "Data Roaming." On Android: Settings → Connections → Mobile networks → Data roaming → enable for the eSIM line.
Data roaming sounds like it should cost extra, but with a travel eSIM it's what allows the plan to work as intended. The eSIM price you paid already accounts for it. Your home carrier's roaming charges don't apply to a separate eSIM line.
The eSIM Hasn't Activated Yet
Some eSIM plans don't activate until you arrive in the destination country, or until you first try to connect to a local network. This is a deliberate design choice by some providers — the data plan starts when you land, not when you install.
If you installed the eSIM at home before traveling and got no signal, this may be working exactly as intended. Once you arrive and your phone picks up a local tower, the plan activates automatically. A brief period of "searching" on the status bar is normal in this situation.
If you've been in-country for more than 30 minutes and still have no signal, it's not just a delayed activation — move on to the other fixes.
Your Phone Isn't Searching on the Right Network
Travel eSIMs route through partner networks in the destination country. Most of the time, your phone will find these automatically when set to automatic network selection. Occasionally, the phone latches onto a network it can't use and stops searching.
Force a fresh network search: on iPhone, go to Settings → Cellular → tap the eSIM → Network Selection → turn off "Automatic" → let the phone search → then turn Automatic back on. On Android, the same option is in Settings → Connections → Mobile networks → Network operators.
During the manual search, you'll see a list of available networks in your location. If you can identify the partner network for your eSIM provider (check your confirmation email or the provider's app), try selecting it manually first. Once connected, you can switch back to automatic.
The APN Settings Are Wrong or Missing
APN (Access Point Name) settings tell your phone how to connect to the mobile data network. Most modern eSIMs configure the APN automatically as part of profile installation. But on some devices — particularly certain Android phones — the APN either isn't set correctly or needs to be entered manually.
Check whether you have an APN set for the eSIM: Android → Settings → Connections → Mobile networks → Access point names → look for an entry associated with your eSIM. If there's nothing there, or if the fields are blank, you'll need to enter the APN details manually.
Your eSIM provider should have the correct APN details in their documentation or support pages. Common fields are APN name, username (often blank), password (often blank), MCC, MNC, and APN type. Entering the wrong APN will still show a signal but data won't load — pages will time out and apps will show no connection.
iPhones generally handle APN configuration automatically through the carrier profile and rarely need manual APN entry. If an iPhone has signal but no data, try resetting network settings (Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings) — this clears old APN configurations and lets the device re-fetch the correct ones.
Resetting network settings on iPhone removes all saved Wi-Fi passwords, VPN configurations, and cellular settings. It won't delete photos, apps, or other data, but you'll need to reconnect to all your Wi-Fi networks afterward.
Carrier Settings Are Out of Date (iPhone)
iPhone carrier settings are small configuration updates that Apple delivers separately from iOS updates. They include network-specific settings for connecting to various operators. An outdated carrier settings package can cause signal problems, especially with newer eSIM providers whose profiles have been updated but your phone's settings haven't caught up.
Check for carrier updates: Settings → General → About. Wait about 10–15 seconds on that screen. If an update is available, iOS will prompt you to install it. After installing, go back to check your eSIM signal.
You're in a Low-Coverage Area
This sounds obvious, but it's worth stating: not every location has good coverage on every network. A travel eSIM routes through one or more partner networks in the destination country, and those networks have their own coverage maps. In rural areas, basements, mountainous terrain, or some older buildings, coverage from any network can be limited.
Test by moving to a different location — ideally outside and somewhere elevated. If signal improves, coverage in the original spot is the issue, not your eSIM setup. If signal is consistently absent across varied locations, the problem is configuration-related and the steps above should help.
The Plan Hasn't Started or Has Already Expired
Most travel eSIMs have a defined validity window — typically 7, 14, or 30 days, starting either from the installation date or from first use. If your plan hasn't started yet (some providers require you to "activate" separately in their app or dashboard), or if the validity period has run out, the eSIM will be on your device but inactive.
Log into your provider's account or check your confirmation email to verify the plan status. If it's expired, you'll need to purchase a new plan. If it hasn't started yet, follow your provider's activation steps — this is sometimes a button in an app, or it triggers automatically on first connection in-country.
Physical SIM Is Taking Priority Over eSIM
If you have both a physical SIM and an eSIM active, your phone may be routing all data through the physical SIM and ignoring the eSIM entirely — making it look like the eSIM has no signal when it's actually just not being used.
Check your default data SIM setting. On iPhone: Settings → Cellular → Cellular Data → select the eSIM. On Android: Settings → Connections → SIM card manager → set the eSIM as the mobile data SIM. If after doing this the eSIM still doesn't show signal or provide data, then it's a genuine signal issue on the eSIM line. If it starts working, that was the entire problem — the physical SIM was just winning priority.
For a more detailed walkthrough of this specific issue, see our guide on cellular data not switching to eSIM.
When to Contact Support
If you've gone through all of the above and still have no signal, it's time to contact your eSIM provider's support. Before doing so, note down: your device model and OS version, the exact error or status showing in cellular settings, which fixes you've already tried, and your location (country and city) when the problem occurs.
A provider with a good support team can check whether the profile was provisioned correctly on their end, whether the partner network in your location is operational, and whether there's a known issue with your device model. Most legitimate signal problems at the provider level have a fix — it just requires someone with access to the provisioning backend to diagnose it.
For future trips, installing and briefly testing the eSIM at home before you travel is the most reliable way to catch these issues while you still have time to resolve them. Our article on avoiding eSIM setup mistakes covers this and other proactive steps that save a lot of trouble later.