It’s completely up to you.
We recommend buying and setting up the eSIM shortly before you travel so you can start using it as soon as you land. You can keep the eSIM switched off until you arrive at your destination.
For the smoothest experience, install the eSIM over a stable Wi-Fi connection to ensure an uninterrupted activation.
However, if needed, you can also install it quickly and immediately from anywhere, even on the go.
Side note: Some countries may have restrictions regarding purchasing or activating eSIMs (e.g., the UAE), so installing it before entering such regions is recommended.