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“Roaming” is the word that stops people from getting online. With a Roamly eSIM it’s just a switch, and it needs to be on.

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No, it won’t cost you extra

Your plan price is all you ever pay. A travel eSIM works by roaming: it’s a SIM from one network that’s allowed to use the networks at your destination, and Data Roaming is simply the setting that lets your phone do that. Leaving it off doesn’t save money; it keeps you offline. The setting that does cost money is Data Roaming on your home SIM. Keep that one off, and your home carrier can’t charge you a cent.

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Turn it on for the Roamly line

1

Open Settings → Mobile

Older iPhones say Mobile Service or Mobile Data; some regions say Cellular.
2

Tap your Roamly line under SIMs

It’s the one you labelled when installing, often Travel; iOS may add the network name after it.
Settings → Mobile with the Roamly line highlighted under SIMs
3

Turn on Data Roaming

Make sure Turn on this Line is on as well.
The Roamly line's settings with Data Roaming switched on
4

Check the data line

Back in Mobile, tap Mobile Data at the top and choose the Roamly line. 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

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And off for your home SIM

Same screens, other SIM: turn its roaming off. If you’d rather not think about it, switch the home SIM off for the trip; see I’m being charged roaming by my home carrier.

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Still not connecting?

Flick Airplane Mode on and off to make the phone re-register, then work through Just landed and no data? Start here.