ESIM CHECKLIST
Check these before travelling with an eSIM.
Do not wait until arrival to discover an incompatible phone, an expired QR code or the wrong data line. Installing and activating are two steps: install while you have internet, turn data on after you land.
Quick answers
How do I know my phone supports a travel eSIM?
Look for “Add eSIM” in Settings, then check the provider’s compatibility tool for your exact model. Carrier-branded and locked phones can fail even when the hardware supports eSIM. Ask the home carrier to confirm the device is unlocked; contract phones can take a few working days.
What is the difference between install and activate?
Install writes the profile to the phone and needs a network. Activate turns on that line’s data and roaming so the plan works at the destination. Many plans must be activated only after arrival — leave data off after installing.
There is no data after landing. What should I check first?
In order: restart or toggle airplane mode; confirm mobile data is the travel eSIM; turn on roaming for that line; check the APN; then use Wi-Fi to activate in the provider’s page or contact support. Do not delete the profile first.
Should I keep my original SIM?
Keep it if you need texts or calls on that number. Turn off its data roaming. After you land, assign mobile data to the travel eSIM. If you do not need the home number you can switch its data off, but test the dual-SIM setup before you fly.
01Confirm compatibility and carrier lock#
In system settings, check that you can “Add eSIM” or add a mobile plan. iPhones from the XS onward and most recent Android flagships support eSIM, but carrier-branded phones, older single-SIM devices and phones still locked to the original carrier will fail. Use the provider’s compatibility checker before you buy; do not rely on the model list in an advert.
Ask your home carrier to confirm the device is unlocked. Contract phones often need a support ticket and a few working days — not departure morning. On dual-SIM phones, check which slot the travel eSIM will use and whether it will displace your usual number. Network lock and unlock are separate: being able to insert a local SIM does not mean you can add an eSIM.
02iPhone and Android install order#
Both platforms do the same job: over stable Wi-Fi, scan a QR code or enter an SM-DP+ address so the profile is written to the phone. The difference is menu names. Leave the default data line on the home SIM until you land — do not switch it during install. The table is a pre-departure checklist, not one provider’s manual — follow the install page in your order.
After installing, do not turn that line’s data on unless the provider says the plan starts at install. Many travel plans must be enabled only after arrival. You should see a second line in Settings even while it stays off.
| Step | iPhone | Android (varies by brand) | Watch for |
|---|---|---|---|
| Where | Settings → Cellular → Add eSIM | Settings → Network & internet → SIMs → Add eSIM | Wi-Fi or home-SIM data required |
| Install | Scan QR code or enter activation code | Scan QR code or enter SM-DP+ manually | Do not share the QR code |
| Label | Name the line, e.g. Travel | Name the SIM so you can tell them apart | Avoid mixing it up with the home line |
| Leave data on home | Keep Cellular Data on the home SIM | Keep Mobile data on the home SIM | Switch the default data line after you land |
| Leave off for now | Keep that line’s data switch off | Keep that SIM’s mobile data off | If the plan says “activate on arrival” |
03Install and activate are not the same#
Install writes the carrier profile to the phone and usually needs a network. Activate turns on data and roaming for that line so the plan works at the destination. Doing both at once is the usual way to burn validity early or start the plan clock on the aircraft.
The order page will say “install now” or “activate on arrival.” The first can be done at home with data left off; the second may require scanning only after you land. Screenshot the QR code, activation code, APN and support link — after landing you often have no home-SIM roaming to fall back on.
04Keep your usual number#
If you still need bank texts or work calls, keep the original SIM on and turn off its data roaming. After you land, assign mobile data to the travel eSIM. Until then, cellular data stays on the home SIM. Voice and SMS stay on the home line; data uses the travel plan once you switch.
If the original is a physical SIM you removed and put back, check that the OS did not switch data roaming on again. Some phones set a new eSIM as the default for calls. Make a test call before you leave so the ringtone is still on your usual number.
05No data after landing: five checks#
Work in this order; do not delete the profile first. One: toggle airplane mode or restart. Two: in Settings, confirm mobile data is the travel eSIM, not the home SIM. Three: turn on data roaming for that line — for a travel eSIM, “roaming” usually means using it in the destination country and most plans require it. Four: match the APN to the order; enter it manually if it is missing. Five: if there is still no service, use airport Wi-Fi to open the provider app or the “activate now” link in the email, then contact support with the order number.
Most failures are the wrong data line or roaming left off, not a plan that failed to provision. Deleting and reinstalling is last resort: without a QR backup the profile may not come back. The data-usage estimator on this site helps you choose a package size. It does not replace the steps on the install page.
06Common mistakes#
Typical mistakes: sharing the QR code in a chat, starting the install after landing with no Wi-Fi, turning on a data line that must wait until arrival, and deleting the original profile with no backup. Another is leaving home-SIM data roaming on, so the first hour ashore incurs roaming charges while the travel eSIM is still off.
Treating “installed” as “online” also fails: seeing a second line in Settings does not mean data is using it. Finish the install at home on Wi-Fi; after landing, only activate and run the five checks. That is more reliable than scanning a code at the baggage belt.
07What to keep offline#
Keep at least: the order number, support link, a screenshot of the QR or activation code, the manual APN, and the sentence that says whether you must wait until arrival. Store a copy in Photos and in cloud storage; do not leave it only in an email that may be offline.
If the phone holds only one eSIM and your usual number is already an eSIM, confirm that adding the travel plan will not replace the home profile. If it must, ask the home carrier how to restore it before you leave. On dual-eSIM phones, add the travel plan in the empty slot; do not overwrite the number you actually use.
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MORE GUIDES
Keep reading before you go
Travel eSIM hotspots: check the plan first, then troubleshoot the phone
A phone that supports Personal Hotspot does not prove that a travel eSIM plan permits tethering. Separate plan, data-line and connected-device checks before relying on it abroad.
How much mobile data will your trip need?
Trip length is only the starting point. Video quality, autoplay, cloud backup and tethering usually decide how many gigabytes you should buy — more than the number of days.
Europe: is one regional eSIM enough for several countries?
Paris to Rome to Barcelona is a network-switch problem, not a reason to buy three SIMs. First ask whether you already have EU roam-like-at-home on a home plan, then check whether the regional eSIM list includes the UK and Switzerland.