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Installing takes about a minute. These four checks stop the handful of things that can go wrong.
1

Be online

Your phone downloads the eSIM from the network, so it needs an internet connection: home Wi-Fi, your normal mobile data, or airport Wi-Fi all work. Home is easiest.
2

Use an unlocked phone

A phone that’s locked to a carrier can’t use another provider’s eSIM. Most phones bought outright are unlocked; if yours came on a plan, check with your carrier. See Does my phone support eSIM? for the full list of supported models.
3

Install on the phone you'll travel with

An eSIM can only be installed on one phone. Once it’s on a phone it stays there, so install it on the one you’re taking. Buying for someone else? Install it on their phone with the QR code — see Can I use my eSIM on more than one device?
4

Leave it switched off until you land

Installing doesn’t use any of your plan. Most plans only start counting when the eSIM first connects to a network at your destination, so once it’s installed, leave the Roamly line switched off and turn it on when you arrive. See When to buy, install and switch on.
A few plans say Starts on installation on the plan page. For those, the days start counting as soon as the eSIM is installed, so install them close to your departure.

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Ready?