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Your eSIM is installed and waiting. When you land, three switches get you online, and your plan only starts counting once it connects. This takes about a minute, and it works before you have any data: the app shows the same steps on your plan page, offline.
1

Turn on your Roamly line

Open Settings → Mobile (older iPhones say Mobile Service or Mobile Data; some regions say Cellular). Under SIMs, tap your Roamly line and turn Turn on this Line on. It’s usually labelled Travel or Secondary unless you renamed it, and iOS may add the network name after it.
Settings → Mobile with the Roamly line highlighted under SIMs
The Roamly line's settings with Turn on this Line switched on
2

Select Roamly for mobile data

Back in Mobile, tap Mobile Data at the top and choose your Roamly line. Only data switches over; if you’ve kept your normal SIM on, calls and texts stay with it. Leave Allow Mobile Data Switching off, so the phone can’t quietly fall back to your normal SIM.
The Mobile Data row, then the picker with the Roamly line selected and Allow Mobile Data Switching off
3

Turn on Data Roaming for the Roamly line

Tap your Roamly line again and turn Data Roaming on. Roaming sounds scary; it isn’t here. Your plan price is all you pay, and this switch just lets your phone use the local network. Only turn it on for the Roamly line.
The Roamly line's settings with Data Roaming switched on
4

Let it connect

Most iPhones find the local network within a minute. If the status bar still shows no signal, flick Airplane Mode on for ten seconds and off again.
You’re online when the status bar shows signal on the Roamly line and a web page loads. Your plan page changes to Active once the eSIM has connected, and the days start counting from now.

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Your normal SIM

Leave its Data Roaming off, as you set it before you flew. Texts still arrive on your number, so bank codes get through, but calls and sent texts may be charged by your home carrier. If you switched that line off entirely for the trip, leave it off. See Can I make calls or send texts?

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Not connecting?

If you’ve done the three switches and Airplane Mode and you’re still offline after a couple of minutes, work through Just landed and no data? Start here. It picks up where this page leaves off: a restart, choosing a network by hand, and what to send us if nothing works.

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When you get home

Switch the Roamly line off and set your normal SIM back as the mobile data line. You can leave the eSIM installed if the plan still has days left, or delete it once it’s expired. See What happens when my plan expires?