How to Activate an eSIM: iPhone and Android Step by Step (2026)
Installing an eSIM and activating it are two different things, and confusing them is why most travelers land abroad with no data. Here is the correct order for iPhone and Android, plus how to find your EID in ten seconds.
Most eSIM problems are not technical. They come from one misunderstanding: installing an eSIM and activating it are two separate steps, and doing them in the wrong order is why people land at an airport with a profile they cannot download and no way to get online.
The short version: install the profile at home while you have WiFi, keep the line switched off, then turn it on when you land. Installation needs internet. Activation starts your plan's clock. Never do them at the same time.
Step 0: find your EID and confirm the phone can do this
Before anything else, dial *#06# on your keypad. No call button needed — the panel appears as soon as you finish typing.
You will see your IMEI numbers and, below them, a 32-digit EID. That is your device's eSIM identifier.
- EID present → your phone supports eSIM.
- No EID → it does not, and no setting will change that. It is hardware.
On iPhone the same number lives under Settings → General → About.
There is a second requirement that catches people out: the phone must be carrier-unlocked. A device still locked to the operator that sold it will reject a third-party eSIM profile even if the hardware supports it. If your phone came on a contract or an installment plan, call your carrier before you travel — unlocking is usually free once the device is paid off, but it is not always instant.
For the full model list, see our eSIM compatibility guide.
Step 1: install the profile, at home, on WiFi
This is the step that must happen before departure.
iPhone
- Connect to WiFi.
- Settings → Cellular (called Mobile Service on some iOS versions).
- Tap Add eSIM, then Use QR Code.
- Point the camera at the QR code in your purchase email.
- When asked to label the plan, name it something obvious — "Travel" or the destination. You will be switching between lines in an airport, and Secondary tells you nothing.
- When iOS asks which line to use for calls, messages and data, you can accept the defaults for now. You will set this properly on arrival.
Android
Menu names vary by manufacturer, which is the main source of confusion.
| Phone | Path |
|---|---|
| Samsung Galaxy | Settings → Connections → SIM manager → Add eSIM |
| Google Pixel | Settings → Network & internet → SIMs → Download a SIM instead |
| Xiaomi | Settings → SIM cards & mobile networks → Add eSIM |
| Generic Android | Settings → Network & internet → Mobile network → Add carrier |
Then scan the QR code exactly as above.
Leave the line switched off when installation finishes. That is the correct state, not a mistake.
Step 2: activate on arrival
Once you have landed:
- Turn the eSIM line on.
- Set it as your mobile data line.
- Turn data roaming ON for the eSIM profile.
- Turn data roaming OFF for your home line.
- Wait two or three minutes for the first network registration.
Point 3 causes the most hesitation, so it is worth being explicit. Enabling roaming on a travel eSIM does not cost you anything extra. The plan is built to roam onto a local host network — that is the entire mechanism. Without roaming enabled for that profile, the line will never connect. The charge you are avoiding lives on your home line, which is why point 4 exists.
Which line does what
After activation your phone is running two lines at once. A useful arrangement:
| Line | Voice & SMS | Mobile data | Data roaming |
|---|---|---|---|
| Home SIM | On — keeps your number reachable | Off | Off |
| Travel eSIM | Not applicable (data-only) | On | On |
This keeps your regular number live for bank verification codes and calls, while all data flows through the travel plan at travel-plan prices.
Timing: when does the plan actually start?
On most travel eSIMs the validity period begins at first connection to a network in the destination country — not at purchase, not at installation.
That means:
- Installing three weeks early costs you nothing.
- Switching the line on while still at home can start the clock early and waste days.
- A "7-day" plan activated on landing runs to the same time seven days later, not to the end of the seventh calendar day.
Check the specific terms of your plan, since a minority start at purchase instead.
If it does not connect
Work through these in order — they are ranked by how often they turn out to be the cause:
- Wait. First registration on a foreign network takes longer than you expect.
- Toggle airplane mode once, on and off. This alone fixes most cases.
- Check data roaming is on for the eSIM profile, not merely for the phone.
- Confirm the eSIM is selected as the data line, not just enabled.
- Restart the phone.
- Select a network manually — turn off automatic network selection and pick a local operator from the list.
Our full troubleshooting guide goes through the less common causes.
Things worth knowing
- Keep the QR code email. It is normally single-use for installation, but you will want it if you ever need to contact support, and some providers can reissue against it.
- Do not delete the profile to "start fresh." Deleting an installed eSIM usually cannot be undone, and a fresh QR is not always available.
- Transferring to a new phone is rarely possible. Install the eSIM on the device you will actually be travelling with.
- Airplane mode does not delete anything. Use it freely during troubleshooting.
Frequently asked questions
How do I activate an eSIM on iPhone? Go to Settings, then Cellular (or Mobile Service), then Add eSIM, and choose Use QR Code. Scan the QR code from your purchase email while connected to WiFi. Label the plan when prompted, then leave it switched off until you arrive at your destination. On arrival, turn the eSIM data line on and enable data roaming for that profile.
What is the difference between installing and activating an eSIM? Installing downloads the eSIM profile onto your phone and requires an internet connection, which is why it should be done before you travel. Activating means switching the line on so it connects to a network, and on most travel plans this is what starts the validity period. Installing early costs you nothing; activating early can waste days of your plan.
How do I find my eSIM number or EID? Dial *#06# on your phone's keypad. An information panel appears immediately showing your IMEI numbers and, below them, a 32-digit EID. The EID is your device's eSIM identifier. On iPhone you can also find it under Settings, General, About. If no EID appears, your device does not support eSIM.
Do I need WiFi to activate an eSIM? You need an internet connection to install the eSIM profile — WiFi or an existing mobile data connection both work. You do not need internet to activate an already-installed profile. This is why the correct sequence is to install at home on WiFi and activate on arrival, when you have no connection yet.
Why does my eSIM say no service after activation? The most common causes are that data roaming is switched off for the eSIM profile, that the eSIM is not selected as the data line, or that the first network registration simply has not completed yet. Wait two or three minutes, then toggle airplane mode once. If it still shows no service, check that roaming is enabled specifically for the travel eSIM, not just for your home line.
Can I install an eSIM before my trip? Yes, and you should. Install the profile as soon as you receive the QR code, while you have reliable WiFi. Keep the line switched off afterwards. On most travel plans the validity period starts at first network connection in the destination country, not at purchase or installation, so installing early does not consume any of your days.
Summary
Dial *#06# to confirm the phone is capable. Install at home on WiFi and leave the line off. On landing, switch it on, make it the data line, roaming on for the eSIM and off for your home SIM. Give it three minutes.
That sequence covers essentially every successful eSIM activation.
New to this? Start with what an eSIM is. Ready to buy? Browse plans by destination.
