Yes - you need an internet connection to install an eSIM. Your device communicates with the eSIM issuer's server to download and verify the profile. Without internet, the installation cannot complete.
Install your eSIM at home on your regular Wi-Fi before you leave. This ensures a fast, stable installation and means you're connected the moment you land.
If you're already at your destination and have no data connection, you'll need to find a Wi-Fi network to install the eSIM. Options include:
Public Wi-Fi at airports or cafes can be slow or restricted. If possible, install before you leave home. If you must install abroad, find a reliable private Wi-Fi network.
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