Install on Wi-Fi, following these steps (Pixel shown; Galaxy and others are similar):

  1. Have your QR code ready (display it on another device, or print it)
  2. Go to Settings → Network & internet → SIMs → Add eSIM / Download a SIM
  3. Scan the code and follow the prompts to finish downloading
  4. Turn on Data Roaming for the eSIM (no extra charges)

On Samsung Galaxy: Settings → Connections → SIM manager → Add eSIM. For arrival steps, see "Getting connected after you arrive".