Install while you still have reliable Wi-Fi
Adding an eSIM requires internet access on many devices. Doing the setup at home or at the hotel before you need the plan avoids trying to troubleshoot from an airport with unreliable Wi-Fi.
Check the activation rule first
Some packages begin when the eSIM first connects to a supported network; others can use a different trigger. Do not assume every plan starts only when you land.
Keep it off until needed if appropriate
If the package starts on first network connection, you can usually install it in advance and leave the line disabled until arrival. Follow the activation rule shown for the exact package.
Save the setup details
Keep the QR code, activation information and support instructions somewhere accessible offline. That gives you a recovery path if another device or browser session is unavailable after landing.
Install early enough to solve setup problems, but only after reading the activation rule for the exact package you bought.