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No app needed: the website can hand the eSIM straight to iOS, as long as you open it on the iPhone you want the eSIM on.
Run through the four quick checks first if this is your first eSIM.
1

Open your eSIM on your iPhone

In Safari on the iPhone you’ll travel with, sign in at onroamly.com/my-esims and tap your eSIM.
2

Tap Add to iPhone

Under Install your eSIM, tap Add to iPhone (one-touch install on this device). Safari hands the eSIM to iOS.
3

Tap Activate

iOS opens Settings and asks to activate your eSIM. Tap Activate. The message about sharing your EID with the service provider is normal: it’s how every eSIM is delivered to a phone.
iOS asking to activate your eSIM, with the Activate button
4

Follow the prompts

iOS asks a few questions. The answers that keep your normal number working as before:
  • Label — call it something you’ll recognise, like Travel or the country you’re visiting.
  • Default line — keep your normal SIM for calls and messages. Roamly is data-only.
  • Mobile data — keep your normal SIM for now. You’ll switch to Roamly when you land.
5

Switch the Roamly line off until you land

Once iOS confirms the eSIM is installed, open Settings → Mobile (older iPhones say Mobile Service or Mobile Data; some regions say Cellular), tap your Roamly line and turn Turn on this Line off. The plan won’t start until you turn it on and connect at your destination.
6

Turn off Data Roaming on your normal SIM

While you’re still at home: in Settings → Mobile, tap your normal SIM under SIMs (usually labelled Primary) and turn Data Roaming off. That’s the switch that stops your home carrier charging you overseas. If you won’t need calls or texts on your number while you’re away, you can turn that line off entirely instead; it comes back exactly as it was when you switch it on at home.
Settings → Mobile with the Primary SIM highlighted under SIMs
The Primary SIM's settings with the Data Roaming switch highlighted
Back on the website your eSIM’s status changes to Installed within a minute or so.

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On a computer?

Add to iPhone only works on the iPhone itself, because it opens that phone’s Settings. If you’re on a computer the website will say so and offer the QR code instead: leave it on screen and scan it with the iPhone. See Install with a QR code or manual setup.

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When you land

Three switches get you online: turn the Roamly line on, select it for mobile data, and turn on Data Roaming for that line only. Follow Just landed? How to activate your eSIM.

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