eSIM technology and carrier support evolve quickly. Device compatibility, carrier offerings, install steps, and pricing can change with software updates and policy revisions. This article reflects the general state of eSIM technology at the time of publication — always check current carrier documentation for the specific device and country in question.
Europe runs on private aviation the way Manhattan runs on yellow cabs — short hops between cities that would otherwise eat half a travel day. JetLuxe brokers light jets and midsize aircraft across every major European FBO, with empty-leg pricing on routes that move daily.
Get a JetLuxe quoteThe most common eSIM problem is the activation itself failing. The error may show as “Unable to add cellular plan,” “Activation error,” “Cannot complete cellular plan setup,” or similar. The fixes, in rough order of likelihood:
1. Check the internet connection. The phone needs working Wi-Fi or mobile data to download the eSIM profile. If the Wi-Fi is intermittent or the existing mobile data is throttled, the activation can time out. Switch to stronger Wi-Fi or wait until in a better-connected area.
2. Try manual entry instead of QR code. If the QR code scan is failing, switch to entering the SM-DP+ address and activation code by hand. The activation details should be in the same email or app where the QR code came from.
3. Restart the phone. A full power-off and restart resolves a surprising number of eSIM activation issues. Try this before assuming a real problem exists.
4. Toggle airplane mode. Turn airplane mode on for 30 seconds, then off. This resets the phone’s cellular state and can clear stuck activation attempts.
5. Check that the activation code hasn’t been used already. Some QR codes are single-use. If the code was scanned previously (even by accident) and registered, a second attempt will fail. Contact the provider to reissue.
6. Contact the provider for a reissue. If all else fails, Airalo, Yesim, and most other providers can void the original activation and issue a new one without charge. Response is typically within 1–24 hours.
If the eSIM is installed but mobile data isn’t working, the issue is almost always in the settings rather than in the eSIM itself. Run through these checks:
1. Is the eSIM enabled? Go to Settings > Cellular (iPhone) or Settings > SIM manager (Android) and confirm the eSIM is toggled ON. Newly installed eSIMs are usually enabled by default, but it’s worth confirming.
2. Is the eSIM set as the data line? On a dual-SIM phone, only one line at a time is the “data line.” If the home line is still set as the data line, the eSIM won’t carry data even though it’s active. Change the data line setting to point to the new eSIM.
3. Is data roaming enabled for the eSIM? Travel eSIMs typically need data roaming turned ON to work (since they’re technically operating on local foreign networks). On iPhone: Settings > Cellular > tap the eSIM > Data Roaming. On Android: Settings > Network > the eSIM line > Data Roaming.
4. Check the data network mode. Some travel eSIMs work best on specific network types (4G/LTE rather than 5G in some cases). Try setting the eSIM’s network mode to “LTE” or “4G” rather than “5G” and testing.
5. Manual network selection. The phone usually selects the best local network automatically. If automatic selection isn’t finding a network, try manually selecting one of the partner networks listed in the eSIM provider’s documentation.
6. Restart the phone. Again, a power cycle often resolves stuck network registration.
Most travel eSIMs are data-only and don’t support voice calling. If the eSIM provider sells voice-and-data plans and calling isn’t working, the checks are:
1. Confirm the plan includes voice. Many travel eSIMs are data-only. The plan’s details should specify whether voice and SMS are included.
2. Check the default call line. On dual-SIM phones, the user picks which line is used for outgoing calls. If the eSIM is the voice line but the default is still set to the home line, calls won’t use the eSIM. Settings > Cellular > Default Voice Line on iPhone.
3. Use app-based calling instead. For most travel scenarios, voice calls through WhatsApp, FaceTime, Signal, or similar apps work over the eSIM’s data connection without needing voice service. This is the recommended workflow for most modern travel.
4. For incoming calls to the home number: ensure the home line is still enabled (Settings > Cellular > home line is toggled ON). Incoming calls to the home number ring through the home line regardless of data settings, though some carriers charge international roaming fees for received calls abroad.
For travellers specifically needing to make outbound calls to local numbers in the destination (booking restaurants, calling taxis, etc.), the realistic options are: app-based calling through services that support local number dialling (Google Voice, Skype Out), or buying a voice + data eSIM plan with local calling capability.
iOS and Android software updates occasionally cause eSIM profiles to behave incorrectly — sometimes the profile appears to be missing, sometimes it shows but won’t connect to a network. The fixes:
1. Reboot the phone. Most post-update eSIM issues resolve with a simple restart.
2. Check Settings > Cellular carefully. The eSIM may still be installed but appear in a different position in the list or with a slightly different name. Look through all the listed cellular plans.
3. Toggle the eSIM off and back on. Settings > Cellular > tap the eSIM > Turn off this line, wait 30 seconds, turn it back on. This often re-establishes the connection.
4. Reset network settings. iPhone: Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. Android: Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth. This wipes Wi-Fi passwords and Bluetooth pairings but typically resolves cellular issues without affecting the eSIM profile itself.
5. Remove and reinstall the eSIM. If the profile is truly missing or broken, remove it entirely (Settings > Cellular > tap the eSIM > Remove Cellular Plan) and reinstall from the original QR code or activation details. Contact the provider for a fresh activation if needed.
The frequency of post-update eSIM issues is fortunately low — most updates handle eSIM profiles correctly. When issues do happen, they typically affect a small minority of users and have been resolved in subsequent point releases. Keep the original eSIM activation details saved (the QR code email, the manual entry information) in case reinstall is needed.
In countries where a travel eSIM has multiple partner networks, the phone may connect to the wrong one — leading to poor signal, slow data, or no service. The fix is to manually select the correct network:
iPhone: Settings > Cellular > tap the eSIM > Network Selection. Turn off “Automatic” and choose a network from the list.
Android (varies by manufacturer): Settings > Connections > Mobile networks > Network operators > Search networks. Choose the desired network from the list.
The eSIM provider’s documentation usually specifies which local networks the plan operates on. For example, an Airalo plan in Japan might list NTT Docomo and SoftBank as partner networks. The user can manually select between them based on which has better signal in their specific location.
Network selection is most useful in:
For users who don’t want to manually manage networks, the “Automatic” setting works for most situations and rarely causes problems in typical urban use.
Sometimes the cellular settings for an eSIM appear missing, greyed out, or restricted. The most common causes:
1. The phone is in airplane mode. Cellular settings are partially disabled when airplane mode is on. Turn airplane mode off and check again.
2. The phone is locked to a specific carrier. Carrier-locked phones may restrict the addition of eSIMs from other carriers. Check the lock status — Settings > General > About on iPhone shows “Carrier Lock.” If the phone is locked, contact the original carrier about unlocking.
3. Profile installation is restricted by a corporate policy. Some employer-managed phones have configuration profiles that prevent adding personal eSIMs. Check Settings > General > VPN & Device Management for any installed profiles.
4. The eSIM is being installed during another active process. Some phones won’t allow new eSIM installs during a system update, certain backup operations, or while a carrier-side eSIM transfer is in progress. Wait for any ongoing operation to complete and try again.
5. Software issue requiring update or reset. Rarely, a software bug can hide cellular settings. Update to the latest OS version. If the issue persists, a network settings reset typically resolves it without affecting the eSIM profile.
For greyed-out specific options (e.g., the eSIM appears but data roaming can’t be enabled), check whether the option is being controlled at a higher level — corporate policy, parental controls, or carrier restriction.
Most travel eSIMs are data-only and don’t support SMS at all. If the eSIM is supposed to support SMS but messages aren’t arriving:
1. Confirm the plan includes SMS. Check the eSIM provider’s plan details. Many travel eSIMs explicitly state “data only — no SMS.”
2. For SMS on the home line: ensure the home line is still enabled and that incoming SMS are not blocked. Some carriers restrict incoming SMS while roaming if the data roaming setting is off for the home line — confirm the home line allows incoming SMS even with data roaming off.
3. Two-factor authentication codes: these typically go to whichever line the sender has on file (usually the home number registered with the service). If 2FA codes aren’t arriving, the issue is with the sending service’s ability to deliver SMS internationally rather than with the eSIM. Some services switch to app-based 2FA when SMS delivery fails.
4. Specific country restrictions: some countries restrict SMS routing in ways that affect roaming customers. This is rare and country-specific, but worth being aware of for travel to specific destinations.
For travellers who depend on SMS for 2FA and similar critical messages, the practical advice is to enable app-based 2FA (Authy, Google Authenticator, account-specific authenticator apps) before travel. This removes the dependence on SMS delivery during the trip and is generally more secure than SMS-based 2FA.
Dual-SIM use (whether physical + eSIM or eSIM + eSIM) typically uses slightly more battery than single-SIM use, because the phone maintains two simultaneous network connections. The difference is usually small (a few percent per day) but noticeable on phones with smaller batteries.
Excessive battery drain after eSIM installation may indicate:
1. The phone is constantly searching for signal. Poor coverage on either line causes the phone to keep searching, which drains battery quickly. Either move to better coverage or temporarily disable the line with poor coverage.
2. Mobile data is being used by background apps. Apps that were previously idle (when only Wi-Fi data was available) may suddenly become very active when mobile data appears. Check which apps are using cellular data in Settings > Cellular and disable cellular access for apps that don’t need it during travel.
3. Frequent network switching. Phones in areas with multiple available networks may switch frequently, which uses battery. Set network selection to manual and lock onto one network if frequent switching is causing drain.
4. Hotspot or tethering left on. If hotspot was turned on for sharing data with a laptop or another device, leaving it on consumes battery continuously. Turn off hotspot when not actively sharing.
For travellers concerned about battery during day-long sightseeing, carrying a small portable battery (5,000–10,000 mAh) addresses the practical problem regardless of cellular settings. Modern phones with eSIM are no more battery-hungry in normal use than single-SIM phones of the same generation.
Most eSIM issues resolve with the troubleshooting steps above — restart, toggle, reset network settings, reinstall profile. Customer support becomes the right path when:
1. The activation code is rejected as already used. Only the provider can void the original and reissue. Airalo, Yesim, and most providers handle this within 1–24 hours through in-app chat or email.
2. The eSIM profile installs but never connects to any network. If the phone shows the eSIM installed but the line never registers (no signal indicator for the eSIM, no networks visible in manual selection), there’s likely an issue with the profile itself that the provider needs to address.
3. Data is enabled and the eSIM is the data line but no data flows. If all the settings look correct but data doesn’t work after a phone restart, the issue is likely on the carrier’s end.
4. After a phone replacement, the eSIM transfer fails repeatedly. Carrier-side reactivation may be needed if the device-to-device transfer doesn’t work after multiple attempts.
5. Billing or account disputes. Anything involving the user’s account, charges, or refunds — these require carrier or provider customer service, not technical troubleshooting.
When contacting support, useful information to have ready: the eSIM provider name, the plan name and purchase date, the phone model and OS version, the specific error messages or symptoms, and what troubleshooting steps have been tried. Providers with good support typically resolve issues within hours when given this information.
Most eSIM problems can be prevented by following a few practices before, during, and after install:
The most common single source of preventable problems is unstable internet during the install. Always install on home Wi-Fi rather than on patchy airport or hotel Wi-Fi. The second most common is incorrect post-install settings — particularly forgetting to set the new eSIM as the data line or forgetting to enable data roaming on the travel eSIM.
With these basic practices, eSIM installation and use is reliable across the vast majority of phones, providers, and destinations. The technology is mature, and modern phones handle eSIM smoothly. When problems do occur, the fixes are usually quick — restart, toggle, reinstall, or contact provider for reissue.
Most activation failures resolve by checking the internet connection (use stable Wi-Fi), trying manual entry instead of QR code, restarting the phone, or toggling airplane mode. If the activation code is rejected as already used, contact the provider to reissue. Most providers respond within 1–24 hours and reissue without charge.
Check that the eSIM is set as the data line (not just enabled), confirm data roaming is turned on for the travel eSIM (off for the home line), and verify that the eSIM is fully enabled in cellular settings. A phone restart often resolves stuck network registration. If data still doesn’t flow, contact the provider — the profile itself may need reissuing.
Software updates occasionally cause eSIM profiles to behave incorrectly. Most issues resolve with a phone restart, toggling the eSIM off and back on, or resetting network settings. If the profile is truly missing or broken, remove and reinstall it from the original activation details. The frequency of update-related eSIM issues is low and they typically don’t affect most users.
On iPhone, go to Settings > Cellular > tap the eSIM > Network Selection. Turn off “Automatic” and choose from the list. On Android, the path is typically Settings > Connections > Mobile networks > Network operators. The eSIM provider’s documentation lists the partner networks for each country. Manual selection is most useful in rural areas or where one carrier has better building penetration.
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