How to install an eSIM, and what to do when you land
Install at home on Wi-Fi, switch on when you land, and three settings that prevent surprises on your bill.
Before the flight: install at home
After you buy, the provider sends a QR code or a link, or installs through its app. It is easiest to install at home on Wi-Fi, a day or two before the flight. Check the provider's terms for when the plan starts counting days.
On iPhone: Settings → Cellular (Mobile Data) → Add eSIM, then scan the code. On Android: Settings → Network (or Connections) → SIMs → Add eSIM. Menu names vary by model and version — the provider's instructions come first.
Three settings that prevent surprises
Give the new line a clear name, such as "Abroad", and set it as the line for mobile data.
On the eSIM line, turn data roaming on — most travel plans only work that way.
On your home line, turn data roaming off, so your carrier at home does not charge for data abroad. You can keep it on for calls and messages, such as verification codes from your bank.
When you land
Turn off airplane mode and give the phone a minute or two to join a local network. If it does not connect: restart the phone, check that mobile data uses the eSIM line and that data roaming is on for it, and choose a network manually if needed.
If it still does not connect, the provider's support is the place to go — they can see the state of your plan.
Do not delete the eSIM mid-trip
With most providers, a deleted eSIM cannot be installed again. Delete it only once the plan is used up and the trip is over.