Before you start:

Steps:

  1. Go to Settings.
  2. Tap Mobile Data.
  3. Tap Add a New Plan.
  4. Scan the QR code.
  5. Follow the on‑screen prompts to activate.
  6. Choose whether to use the eSIM as default mobile data, or alongside a physical SIM.

Source: https://support.limitflex.com/en/articles/9720399-how-to-install-an-esim-on-ipad